Very cool game! It did so many things right! It had a nice menu, remappable keys, and fitting music/sound effects. One problem is that it didn't really fit the theme. A sugggestion is that you could include a powerup that each player gets periodically that could "switch" players so Player 1 would be controlling Player 2 and vice versa. That would be a fun mechanic. Also if you wanted to further puruse this game you can try adding an AI so a person playing alone could enjoy this game as well.