If you were more of a gamer person I would suggest you to make a Steam Group, that way you could play and interact more with your watchers
Here go some ideas/opinions:
Firewatch is indeed a nice game, somewhat slow paced, chilling game with awesome visuals. Shame it is so small.
If you like puzzle/mistery games, Machinarium might be pleasing as well, and being a 2D game, runs on almost anything (Linux included).
Braid is a nice platformer that is praised by many people. A bit more action based though, has a nice story to it.
FEZ has some unique visuals, it is a nice platformer with a nice story to it. It has LOTS of secrets to it, though if you are not a math/logic inclined person there are some puzzles that will frustrate you.
As for pure puzzle Cogs is one of my favorites... though if you don't like the idea of solving a Rubik's cube (the game doesn't make you solve one, but the challenges get harder and harder) you might want to pass this one...
Currently, the only game on Steam that catches my interest is Firewatch, the environments look stunning and I'd like to explore in there and all ovo There aren't a lot of games that catch my interest, and I don't know if my laptop will run them - however, the fact that Life is Strange suddenly decided to work has given me hope, so I might look into some games! I'm not much of a gamer person, but I'm sure there are some games that I'd enjoy.
I'd prefer to not dig into my own funds all the time, so I mean, offering a discounted commission for it instead seems fair, no?