Ah yeah, coop multiplayer!
1 would be a fun screaming match, I feel! 2 allows for more collective brainpower, I think I'd prefer 3 the best, though!
Maybe the levels are bigger and players get placed on random positions. Since there are 4 different colors for buttons, each player could have the button assigned that matches their own color, but working together to just hit all buttons would be fun too! I think the random placement would help avoid 'optimal' moves for all players, instead requiring each player to think for themselves
Last man standing scenario also sounds pretty fun and intense! I would definitely get the red enemy out of that mode, haha
Thank you for the inspiration!