I really like the concept for this game, but I think it could have used some tweaking. At first it wasn't clear that I was hurting myself, since I started by using the laser. But after figuring that out I felt it was just a bit too hard to avoid hitting yourself, especially since the round enemies tend to bounce your shots right back at you. I think the waiting bounce gun would be the most fun one to use, but with how many enemies spawn it gets a bit ridiculous. Also you can move into the sides where the enemies spawn, and they can get you stuck in there with no real way to get out since they just keep spawning. Here's a screenshot of where I got stuck in the corner: 
Some sound effects, even just for firing, would have really helped, but the art and color palette were nice. Could definitely see this becoming a very fun game if tweaked and expanded upon.