Half-Life: Alyx is Valve’s VR return to the Half-Life series. It’s the story of an impossible fight against a vicious alien race known as the Combine, set between the events of Half-Life and Half-Life 2.

Story

Playing as Alyx Vance, you are humanity’s only chance for survival. The Combine’s control of the planet since the Black Mesa incident has only strengthened as they corral the remaining population in cities. Among them are some of Earth’s greatest scientists: you and your father, Dr. Eli Vance.

As founders of a fledgling resistance, you’ve continued your clandestine scientific activity—performing critical research, and building invaluable tools for the few humans brave enough to defy the Combine.

Every day, you learn more about your enemy, and every day you work toward finding a weakness.

Starting development shortly after The Lab in 2016, Valve acquired Firewatch devs Campo Santo to assist in developing Half-Life: Alyx to release March 23rd, 2020 making it the first Half-Life since 2007. In The Valley of Gods's cancellation would be the product of Campo Santo dissipating.

HLA or originally leaked as "HLVR" first started appearing in strings/leaks in 2017/2018 by Tyler McVicker.

Fast forward to November 2019 and Valve officially announces Half-Life: Alyx for a March 2020 release date.

March 23rd, 2020 HLA releases to massive success and acclaim proving to be a major hit for VR and for Half-Life becoming one of, if not, the best VR game on the market after Beat Saber

Workshop tools are released resulting in high-quality mods, some even turning into retail products such as Gunman Contracts, while also spawning a couple expansion sized mods including Levitation which was featured at the PC Gaming Show in 2022.

Half-Life Alyx would go on to inspire new VR games such as Vertigo 2 and Metro Awakening to become huge hits for VR

The future of the series isn't confirmed for VR, but it is clear it will continue...

If you've beaten HL: Alyx and want to experience the game an entirely new way

OR

Are unable to use VR for various reasons, there is a way to enjoy the game without compromising comfortability.

NoVR mod allows you to play through the entirety of Half-Life: Alyx in Pancake Mode with M+K.
You can play Alyx like a normal FPS and not need an Index or VR Headset with this and enjoy the story and gameplay thats custom to the mod. Now there are two versions of NoVR. One by a solo dev and the other by a dev team. Both have their merits so its up to you to decide.

Half-Life 1 and 2 have their own Half-Likes and so does Alyx. A few VR titles have been close to Alyx's aswell as being influenced.

Half-Life 1/2 and Episodes
Not a Half-Like cause its from the actual series, but the VR mods for the other games have taken lessons from HLA and applied them where necessary making playing through the series in VR

Gunman Contracts
Workshop addon turned retail. Gunman Contracts is a John Wick esque VR FPS

Vertigo
Vertigo developed by Zach is a pretty HL inspired VR shooter. Even to the point Zach worked at Valve for a short time before launching the sequel Vertigo 2 which itself is also HL influenced.

Vertigo 2
Sequel to Vertigo Remastered, V2 is a VR HL in many ways. Spoilers aside, it features references and easter eggs and shares a similar feeling to Half-Life: Alyx. Zach did a great job making two VR titles feel like they belong

Metro Awakening
Metro VR is a pretty big VR Half-Like in terms of gameplay and artstyle. It resembles a close Alyx artstyle with the type of gameplay you'd find in HLA. It's also a big FPS turned VR just like HL

Half-Life: Alyx works a bit differently because of being in VR but you can still use cheats and console commands.

First, goto the games launch options and add the following
-console -vconsole
Launch the game and it should be enabled
Additionally, theres some other launch commands i'd recommend adding

+hlvr_continuous_normal_speed 120 - Modifies player speed
+hlvr_continuous_combat_speed 120 - Modifies combat speed
-dev - Enables a dev menu with quick actions
-fullscreen -w 1920 -h 1080 - Replace the width and height with the resolution of your own monitor.

In-game press [~] to open the console like previous Half-Life games and then you can enter commands

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sv_cheats 1 - Enables cheats
god - invincibility
Impulse 101 - All weapons and 20 resin
Impulse 102 - Unlocks all weapon upgrades
sv_infinite_ammo 1 - Unlimited mags and shells
sv_infinite_clips 1 - Unlimited ammo, never have to reload
hlvr_setresources_ <Pistol Ammo> <SMG Ammo> <Shotgun Ammo> <Resin> - Sets specific ammo and resin values
vrfly_enabled_1 - Lets you fly around with your keyboard using WASD

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Weapons & Items

Pistol - give item_hlvr_weapon_energygun
AR1 - give item_hlvr_weapon_rapidfire
Shotgun - give item_hlvr_wepon_shotgun
Healthkit - give item_healthvial
Flashlight - hlvr_give_flashlght
Flashlight at your feet - give item_hlvr_flashlight
Multitool - give item_hlvr_multitool

CH1 - Entanglement

• a1_intro_world
  
• a1_intro_world_2

CH2 - The Quarantine Zone

• a2_quarantine_entrance
  
• a2_pistol
  
• a2_hideout

CH3 - Is Or Will Be

• a2_headcrabs_tunnel
  
• a2_drainage
  
• a2_train_yard

CH4 - Superweapon

• a3_station_street

CH5 - The Northern Star

• a3_hotel_lobby_basement
  
• a3_hotel_underground_pit
  
• a3_hotel_interior_rooftop
  
• a3_hotel_street

CH6 - Arms Race

• a3_c17_processing_plant

CH7 - Jeff

• a3_distillery

CH8 - Captivity

• a4_c17_zoo

CH9 - Revelations

• a4_c17_tanker_yard

CH10 - Breaking And Entering

• a4_c17_water_tower
  
• a4_c17_parking_garage

CH11 - Point Extraction

• a5_vault
  
• a5_ending

Half-Life: Alyx features 42 achievements

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Half-Life: Alyx has some really good Workshop mods worth checking out. I've compiled a list of the most noteworthy.

Lost Coast
Levitation
From Here to There
Loco-Motive
Runway
Vinesauce Holiday Special
Vinesauce Halloween Special
Gunman Contracts
Incursion
Overcharge
ApertureVR
Return to Rapture
Resident Alyx Biohazard
Goldeneye Alyx 007
Field Studies
Post-Human
P.T
Re-Education
E1M1 Redux