And they say couch co-op is dead. Enter the Gungeon came out back in 2016, but its developers at Dodge Roll keep finding reasons to bring it back to PAX East. Of course, even back then it had local co-op, before getting ported to Switch made that sort of thing cool again.
DISCUSSION
I really like (and need to get back to) Enter the Gungeon. However, the game balance does not favor a coop mode (unless they changed things in their big expansion/balance update)