I liked the feeling in the plasma gun, nice particles on the bullets!
It was a little annoying that the wasps respawned every time i reentered a room, they were really fast and good at dodging bullets (which was a cool feature). Some of the models were really nice!
A resume button in the menu could have been... Good if you wanted to change volume while playing :D
Some uptempo techno style music or something could have been nice!