I love this community, got so many recomendations I decided to update the first post! Sorry if I couldn't reply to everyone, Jerboa almost exploded, haha. But I'll upvote all your contributions now that I'm on PC.
Original post
I like to play on the same computer with my bf, and recently we've started to get tired of MAME since we've been playing our faves on repeat for so long.
The other game we play is Spelunky, since is the only local co-op game I have on Steam. I ask because Steam summer sales are close and I can give him a surprise :D
I wouldn't recommend A Hat in Time, the local co-op is really bad because of how the camera works. :(
A few steam games I know:
ibb & obb
Dinasty Warriors 8
We played on PS but also available for pc:
It Takes Two
Stardew Valley
Children of Morta
Divinity: Original Sin 2
Cuphead
Guacamelee
Moon Hunters
Out of Space