I just had a look at your game.
It seems unfinished, but what there was played well, I actually ran out of ammo and killed over a hundred enemies.
I also had fun bouncing around, I figured out that if you looked down towards the green slabs, you almost had like a power jump, so I basically jumped on the spot and the enemies couldn't hit me.
Probably means I broke your game, but it was fun when I figured out the jump trick, I could cheese it and wait for the enemies to line up for slaughtering.