Wildermyth is an awesome indie RPG that I’ve had a lot of fun with as a two-player coop game. It’s a turn-based dungeon crawler with a strong focus on role play and party dynamics.

I hear great praise for Across the Obelisk as a coop game from my friends, although I personally bounced off of it. It’s a roguelite deck builder like Slay the Spire, but with multi-player, lots of meta progression, and a heftier time commitment for each run.

Gunfire Reborn is a roguelite looter shooter that’s a blast in coop. I think it’s still in Early Access, but what’s already there is enough for me to be happy with it as a full game. To me it’s a spiritual successor to Borderlands in combat and gamefeel, but without the grinding.