Spectraball - Very enjoyable, kinda poor on environment aesthetics on the later levels but the game itself is very enjoyable, it's comparable to Ballance but you don't have multiple weighted balls and you instead have a special move. The campaign is pretty poor in level quantity but very varied, and then there's the tons of user-produced content which is for the most part enjoyable.
Prison Architect - Gud enough.
E.Y.E.: Divine Cybermancy - Awesome for a source engine game, really well done.
Project Zomboid - Great example for a early access title, it may as well be released as-is and still be a great title.
Battleblock Theater - Played up to Ch. 4 in co-op and I enjoyed this a lot.
Planetary Annihilation - Only played with a friend in co-op with him against the AI, crashed for like 3 times as the host but interestingly enough I was able to join back. The AI is simply brutal even on easiest difficulty and we were barely able to defeat even one (We did do it though.). It bugged me a lot when I seen $10 and $15 microtransaction ACUs on a full-paid title, this is plain out cowmilking out of a game that is not even released (if). But the game itself is quite enjoyable. But I would rather play SupCom.
War of the Vikings - War of the Roses was better, this is a great downpour and I can't even get constant 60 FPS on low settings. It's sort of enjoyable though if I am not to compare it to WotR but I can't enjoy it fully due to lacking performance. A game like this is unreasonable to have PC lag at even on lowest.
Takedown: Red Sabre - I don't know why I thought this would've been a good idea in the first place.
Broforce - I am too bad at it to find it enjoyable, not that it's a bad game.
I have not played the following yet, but I did get them:
Banished
Space Engineers
Metro: Last Light
Metal Slug 3
Don't Starve
Darksiders II