I would be curious about your favorite coop games. I often find them a big lacking, often being a bit unbalanced. An example is Battle for Hogwarts, where one game can be a walk in the park and another absolutely impossible and rarely is there a balanced match.
I recently went to a convention and picked up Clear the Decks which is an old timey naval combat game where 1to 4 players work together to sink an enemy ship. It has a variety of difficulties that scale from trivial to dang near impossible to beat.
If you like the theme I think it’s worth checking out.