Well Made Game
This is *much* better than you make it sound - the graphics are cool and unusual for one thing, but it's also a generally well made game without any annoying bugs or clunkiness. The monsters are really cool - they look kinda like sperm and die by exploding into white goo. That had to be deliberate XD
I wouldn't worry about the fact that this idea has been done before; making a high quality game with an old concept is better than coming up with something original that sucks.