Casual/solo ideas
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The Turing Test (pls 100% it's not a long game)
Stardew
Rimworld (Resource mgmt) (I can get this for you for free I think) (Infinite replay value imo) (Kinda hard to grasp at first)
A Story About My Uncle (I will buy you this game it is very good) (Also a short game worth completing) (Fantasy/3d platformer)
The Witness (Puzzle)
The Wolf Among Us (Telltale)
Antichamber (Puzzle)
SUPERHOT (Action/Strategy)

Squad/Public/Sub ideas
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PUBG squad
GWYF pub
GTA Heists squad
Shellshock squad/pub/sub
I would be willing to eventually fund a Worms series group because I own most of them also squad/sub/maybe pub but prob not
L4D2 Squad/sub
H1Z1 Squad/sub
Golf it/Winning Putt Squad/sub