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I'd give you the game for SEUM: Speedrunners from hell + Project Highrise. I looked at the key prices and they seem to be reasonable but I'm not sure if you'll like this offer lol.
Anything from my list (https://www.steamtrades.com/trade/D6TMW/h-various-games-w-games-from-my-want-listpaypalrevolut) for your Surviving Mars?
Surviving Mars (Humble Bundle Gift Link)
Shadow Warrior 2
Arma 3
Post Scriptum
DiRT 4
Hell Let Loose
Megaquarium
Monster Hunter: World
Team Sonic Racing
X-PLANE 11
Microsoft Flight Simulator X: Steam Edition
Eco
KartKraft
Workers & Resources: Soviet Republic
Outward
Flyinside Flight Simulator
Sailaway
Feel free to offer me other games and links to your game posts these are just my preferred ones.