Thanks, I'll keep that in mind! But I do feel like there's an over-abundance of mindless co-op games where you just zone out and shoot things or whatever. If I made a co-op game I'd want to make something that asks something of its players, like Overcooked or Lovers in a Dangerous Spacetime, where you really have to communicate to work together. Actually, I wasn't even thinking about co-op much, but I love co-op games!
But yeah, it has to be something you can communicate to the player easily, and that's tricky.