Thanks guys, I will have a look into some of these.
I kind of underestimated what a problem it would be that the Steam Machine is on SteamOS and a lot of the library won't work. All the shooters I've found so far are Windows only :/
Check out broforce, it's really fkn fun and can get pretty chaotic with multiple players
https://youtu.be/-bZGzSrAgQE
A good advice for all timesMy advice would be to wait till the summer sale for the domain games, cause they're not for everyone and usually dirt cheap. Hard to complain when you buy a shitty game and it's only .99