Before you buy - do note that this game will be better in future, a lot is planned.
Recently a new open betatest patch has been released, .14 that would be, and it is a big leap to what has been in game before. They have added atmosphere to planets, gravity and its effects, including movement g-forces, and a few other things, as well as made gui easier to read.

I would say if you want to support developers and not afraid to wait a few years until game is finished - welcome.
And you can play it now, it does work, but it will only get better with time from what it is now.

Pros
+ Immersive
Quite a lot immersive elements, gui sometimes, worldbuilding really does it. Oxygen, heat, part decay and tools, there are a lot of elements there. Even each docking session is a minigame of sorts, which is close to how it is in real life, but in 2d movement and way greater speeds. It leaves space for fun, after all. THERE ARE GUIDES TO REACTOR, NAV CONSOLE AND STUFF THAT LOOK LIKE REAL MANUALS! I have almost never seen that in other games, it really adds to it.
+ Free to explore and roleplay
You can be anything you want and manage to be. Want to work under corp you were born into? Or you want to go outlaw and refuse to pay docking fees anymore? Or you want to reject society and just kill everyone you find your hands on? Heck, you can get your ship in a mortgage and just not pay it, though it will result large fines that you will be forced to pay once you dock to public station, unfortunately. You can become a sort of pirate, docking to other people ships, killing them and them scrapping their ships for parts, since no-one will ask where they come from, no witnesses.
Or you can become an interplanetry trader that multiplies money. Or you can roleplay as moron and go outside of airlock without a helmet on.
+ Quite a few mysteries
Unfortunately, cant write much here, its not fun if you dont figure this yourself, but first interaction with REDACTED will leave you REDACTED and that is REDACTED. Also, first time I saw REDACTED I have REDACTED, I kid you not.
Purple suit is a lie purple suit is a lie purple suit is a lie purple suit is REDACTED
+ Quite some content
There is some content already present, enough for a ~40 hours if you really want to visit it all and know how to, but most of that time you will make money, though. Thankfully, most of it will happen as you collect money, in-between.
+ Ship building system
It is not too hard, not too easy. Just ideal in my opinion - you dont have to micromanage every wire and pipe, yet you cant just slap some gas cans on a box and call it a ship - you need more than that, especially if you want to fly on it longer than a day or two. You dont HAVE to seal the hull, but you will last as long as your suits oxygen/power. You dont need a reactor, but you will essentially run on accumulators, which means if you dont manage your power closely you will find yourself stranded on piece of scrap hundreds of kilometers off any station. Oh, and now that they added atmosphere, you can fly in there and its somewhat complex, you cant just strap some wings and propellers on your 200 tonned hauler and expect if to fly.
+ Devs are cool people
This is more of a personal one, but you can talk to them on games discord channel, they often show up there and talk to people, they dont hide and interact frequently, which means if you really want to you can influence games development in a way, perhaps. After seeing a lot of those detached companies that just make profit and think of their customers as "big needy babies" this is some fresh air.
+ Price
It is somewhat cheap, it is certainly not expensive. Right now might be a bit too much, but you can think of it as a pre-order of sorts, thats why its early access, but in my country its costs as a large mcdonalds meal, unlike some other games that can reach costs of a new smartphone.

There are some cons, though, cant be without it
- Game is somewhat raw
Yes, there is some content already, but if you really look into it there isnt that much to do. Until recently there was only one planetoid and surrounding stations available, which really limited what you can and will do.
- Bugs, bugs!
They are everywhere, such is the way. But you can report them though, there is an easy form you can do that in devs discord, but takes time to fix, and some of them can be really annoying, like 6 hours timeskip doesnt empty your sleep need, while sitting for 30 minutes with 16x time speed will.
- Lack of multiplayer
This is unfortunate, as I really would like to play this game with my friends, but such is the nature of this game that this is simply not possible. Although, they might make a pvp mode just for that, maybe...
- Some features lacking
Yes, games bones and some meat are in place, but small features really make it annoying, like, there is no way to replenish small oxygen canisters, if you try to fill them up with normal pumps they just blow up, because they pump more pressure in one tick than that poor alluminum bottle can take. There is a crew system, but there are barely any uses for them. Sure, you can just order them to completly dissasemble some ship and haul it all home, or use second crew member as your character while main one sleeps, but you have to pay them and there is a death fee you pay if they go outside of airlock without a helmet, and for some reason they do that more often than I would want... Yes, there is a way to buy citizenship and get an apartment of your own, but you can only buy same one, they didnt add more yet. Again, this is to be added in future, they have confirmed that, this is more of a "buy now" con.
- lack of variety in some things.
There are only 3 food brands, cheap af preserfved food with like 10 variations of flavout and two street vendors, who offer 3 dishes each. Few tools - screwdriver, hacksaw, their better versions angle grinder and power drill, small welder, soldering tool and their better alternative, laser tool. And crowbar. Could really use a few more brands/variations of tools, so that there are diffrent brands of power drill for example, even if its just 2 or 3. Not that critical compared to some other things, like, game has illegal station with "drug seller" but no drugs except for 4 types of pills (medical), 3 types of injections (medical) and basically thats it.

Before you buy - do note that this game will be better in future, a lot is planned. Recently a new open betatest patch has been released, .14 that would be, and it is a big leap to what has been in game before. They have added atmosphere to planets, gravity and its effects, including movement g-forces, and a few other things, as well as made gui easier to read. I would say if you want to support developers and not afraid to wait a few years until game is finished - welcome. And you can play it now, it does work, but it will only get better with time from what it is now. Pros + Immersive Quite a lot immersive elements, gui sometimes, worldbuilding really does it. Oxygen, heat, part decay and tools, there are a lot of elements there. Even each docking session is a minigame of sorts, which is close to how it is in real life, but in 2d movement and way greater speeds. It leaves space for fun, after all. THERE ARE GUIDES TO REACTOR, NAV CONSOLE AND STUFF THAT LOOK LIKE REAL MANUALS! I have almost never seen that in other games, it really adds to it. + Free to explore and roleplay You can be anything you want and manage to be. Want to work under corp you were born into? Or you want to go outlaw and refuse to pay docking fees anymore? Or you want to reject society and just kill everyone you find your hands on? Heck, you can get your ship in a mortgage and just not pay it, though it will result large fines that you will be forced to pay once you dock to public station, unfortunately. You can become a sort of pirate, docking to other people ships, killing them and them scrapping their ships for parts, since no-one will ask where they come from, no witnesses. Or you can become an interplanetry trader that multiplies money. Or you can roleplay as moron and go outside of airlock without a helmet on. + Quite a few mysteries Unfortunately, cant write much here, its not fun if you dont figure this yourself, but first interaction with REDACTED will leave you REDACTED and that is REDACTED. Also, first time I saw REDACTED I have REDACTED, I kid you not. Purple suit is a lie purple suit is a lie purple suit is a lie purple suit is REDACTED + Quite some content There is some content already present, enough for a ~40 hours if you really want to visit it all and know how to, but most of that time you will make money, though. Thankfully, most of it will happen as you collect money, in-between. + Ship building system It is not too hard, not too easy. Just ideal in my opinion - you dont have to micromanage every wire and pipe, yet you cant just slap some gas cans on a box and call it a ship - you need more than that, especially if you want to fly on it longer than a day or two. You dont HAVE to seal the hull, but you will last as long as your suits oxygen/power. You dont need a reactor, but you will essentially run on accumulators, which means if you dont manage your power closely you will find yourself stranded on piece of scrap hundreds of kilometers off any station. Oh, and now that they added atmosphere, you can fly in there and its somewhat complex, you cant just strap some wings and propellers on your 200 tonned hauler and expect if to fly. + Devs are cool people This is more of a personal one, but you can talk to them on games discord channel, they often show up there and talk to people, they dont hide and interact frequently, which means if you really want to you can influence games development in a way, perhaps. After seeing a lot of those detached companies that just make profit and think of their customers as "big needy babies" this is some fresh air. + Price It is somewhat cheap, it is certainly not expensive. Right now might be a bit too much, but you can think of it as a pre-order of sorts, thats why its early access, but in my country its costs as a large mcdonalds meal, unlike some other games that can reach costs of a new smartphone. There are some cons, though, cant be without it - Game is somewhat raw Yes, there is some content already, but if you really look into it there isnt that much to do. Until recently there was only one planetoid and surrounding stations available, which really limited what you can and will do. - Bugs, bugs! They are everywhere, such is the way. But you can report them though, there is an easy form you can do that in devs discord, but takes time to fix, and some of them can be really annoying, like 6 hours timeskip doesnt empty your sleep need, while sitting for 30 minutes with 16x time speed will. - Lack of multiplayer This is unfortunate, as I really would like to play this game with my friends, but such is the nature of this game that this is simply not possible. Although, they might make a pvp mode just for that, maybe... - Some features lacking Yes, games bones and some meat are in place, but small features really make it annoying, like, there is no way to replenish small oxygen canisters, if you try to fill them up with normal pumps they just blow up, because they pump more pressure in one tick than that poor alluminum bottle can take. There is a crew system, but there are barely any uses for them. Sure, you can just order them to completly dissasemble some ship and haul it all home, or use second crew member as your character while main one sleeps, but you have to pay them and there is a death fee you pay if they go outside of airlock without a helmet, and for some reason they do that more often than I would want... Yes, there is a way to buy citizenship and get an apartment of your own, but you can only buy same one, they didnt add more yet. Again, this is to be added in future, they have confirmed that, this is more of a "buy now" con. - lack of variety in some things. There are only 3 food brands, cheap af preserfved food with like 10 variations of flavout and two street vendors, who offer 3 dishes each. Few tools - screwdriver, hacksaw, their better versions angle grinder and power drill, small welder, soldering tool and their better alternative, laser tool. And crowbar. Could really use a few more brands/variations of tools, so that there are diffrent brands of power drill for example, even if its just 2 or 3. Not that critical compared to some other things, like, game has illegal station with "drug seller" but no drugs except for 4 types of pills (medical), 3 types of injections (medical) and basically thats it.