Rotwood is a good one. Co-op Roguelite beat-em-up from the Don’t Starve guys.

Lethal Company is just lots of fun, we’ve gotten too much time out of that dumb game. Maybe check out Content Warning if you like LC but want a change.

Outward is a fantastic old-school RPG for two people, has all the traits of a game from 2002

Palworld - haven’t hopped back into this one since its launch but have been meaning to. But this type of game is definitely not underrepresented on the market.

Escape Simulator is a nice stress-free co-op escape room game, lots of official content and also has Steam Workshop so there’s tons of great content.

PlateUp! if you’re not worried about getting into a fight over how awful your buddy is at making food

Rogue Heroes: Ruins of Tasos is a Zelda-like RPG that’s a surprising amount of fun for how simple the game first looks.

Other bigname recs: Tiny Tina’s Wonderlands, Baldur’s Gate 3, Sea of Thieves, Deep Rock Galactic, Stardew Valley

Brotato is always a recommendation. Single player or co-op doesn’t matter. Both modi are great

I enjoyed “It Takes Two” quite a bit. “A Way Out” is another co-op game from the same publisher that I’ve only heard good things about.

It’s a game from 2014, but I love Double Dragon Neon which is 50% off. I have songs from the game in my regular music playlist they’re so good. I enjoy it more than the recent Double Dragon Gaiden. Great coop.