Small update showing how some common weapons scale into level 5 (1 hour into Endless Normal):

Early access version, 22nd March 2025
Stats taken at time 2:51:30 into the Endless Run
PS. I have 313K kills, so long ways to go for the 1M kills achievement

Weapons
All enemies die very fast and probably affect some dps stats; shorter range might struggle keeping up with the rest, and enemies doesn't reach mine layer's mines.

Income
Wise Investment appeared bugged here, but it was crucial to build up the extreme income at the start. Theoretically it should always be the best, but Hand of Midas might be better because of the bug (might just be a visual bug and cause an error in the number because the number is so insanely big).
2025-03-31 update update: Wise Investment can easily become the majority of your income by 40 minutes, and by 1 hour mark 99.99% of your income (making all other sources neglible). It's super strong. Still start with some Gem Generators early on, but ignore Hand of Midas as I don't see it worth investing in when Wise Investment takes over all income anyways later on.

Mid Game -> Late Game carriages
Common - Uncommon - Rare - Epic - Legendary
• Sonic generator [Uncommon] - Started with this, so naturally level that up a bit
• Energy Disk [Common] - Huge aoe DPS and fairly easy to get level 5 first
• Flame Thrower [Epic] - One of the best DPS even though it might not look like it in these stats
• Hyper Beam [Legendary] - You "win" if you get this to level 5
• Gem generator [Common] - Not sure but I think it helps a lot early game until you transition to Wise Investment. I level this to 5 in mid game, but I don't think it was worth it. Maybe leave it at lvl 4
• Life Drainer [Uncommon] - I didn't level this beyond level 2, but the life steal helps
• Wise Investment [Rare] - Once you buy ~40 of these you can quickly double your income by saving a bit of gold. I recommend to get at least lvl 4. Suddenly I'm sitting on trillions of gold and maxed out most upgrades.

This is what I bought and started upgrading first ^ It might not be optimal and I hope this guide can help you make decisions and try other options. Just remember pig is king