pretty damn good
it was a lot of fun. it got way boring after you bought overkill and the laser cannon; you could earn something like 40000 experience in one good round, almost enough to buy everything in the game. also, the way the bodies piled up was neat at first but after two or three levels it got pretty difficult to see what was going on. it'd be better if they faded off or reset or something.
other than those two things it was a pretty excellent game