We really have to prioritize fixing the mac version! We fought with tooth and nail the last days in order to do everything we could to improve the performance for the mac users. It means a lot that you like the game, even though the general experience might have been suboptimal. A cooperative mode would be wild!
Anyway, it's nice to read about the game perspective from a mac user, as I was afraid the performance would be too bad for the game to even be playable. Thanks a ton for playing and commenting :-)