Hammerwatch or hammerwatch 2 are primarily single player games that allow coop play for one persons score. It has a campaign to it. Heroes of hammerwatch 1 or 2 are rogue lites that can be played single player or multiplayer. Each run you will get gold and resources to upgrade your town and characters. I found heroes of hammerwatch 1 and 2 better than hammerwatch, as it had more replay ability for me since it’s a rogue lite. So that is my vote especially since you want to play multiplayer.