Here’s a list of co-op games I have had a ton of fun with while playing with friends:

Deep Rock Galactic on lower difficulty is a great long term game you can pick up randomly and for 45min at a time. You can also adjust the difficulty between each run depending on mood and join random lobbies pretty easily. Rock and stone.

Valheim is a good Minecrafty option that’s entirely self-driven and has a chill vibe. If you love Vikings, you’ll love this game

Portal 2 has an amazing co-op experience, but it’s pretty short. Absolutely worth it though.

Phasmophobia if you’re into horror movie style gameplay and goofing off despite a ghost scaring the shit out of you

Factorio (or Cracktorio) if you like building things and watching them go brrrrr