If I’m going 100% casual I just like to kick back and play some animal crossing with friends, if you want something a little more competitive THERES like smash bros. I agree with the people saying over cooked too
I haven't tried the co-op yet but stardew valley is my top choice for chill games. You can always find a game for everyone on tabletop simulator as well
Raft has been a very very chill vibe with a good friend of mine, though its still early access and the story isn't yet finished but I wholeheartedly recommend it