I've bought the Valve Complete Pack so I have all the Valve games, and I'm using Linux so Payday, Undertale, Saints Row, Metal Gear and Spore etc. won't work. I also don't care for The Binding of Isaac's artsyle, I do like that type of game though. I've also played through Cave Story on the Wii and it was really good, but I don't really want to buy it for the computer. I also don't really like horror games
I hope that's enough for you
Also my GPU sucks (I'm planning on getting a new soon though) so older and/or not as GPU intensive games are nice