Really interesting take on the theme.
Very enjoyable to play.
Pretty good, one suggestion: It seems like it takes a small amount of time for enemies to be killed, maybe apply a tint to the enemies as they get weaker?
Also, score doesn't reset in between rounds. Not sure if that's intentional.
Thanks! We actually just patched the null reference error that had broken a big part of the game and ramped up the memory used by our web player, so things should be a little less broken now, though.