Decent little game. The coop aspect is crucial to playing, otherwise the player is just there to create their own enemies. Perhaps you could create some automatic enemy spawning as one player mode. 

Nice game idea. Really like the coop portion of the game. Small bug where you can't return from the help menu but that can be overlooked. More could be added to the game, it is a really fun idea. Player one has no win to win though xD and player two can wait for a few minutes to stockpile money and destroy player 1. Hope to see more.