Solid game. Not being able to move and shoot really mixed up how it would normally play. I wasn't too good at adapting to it.
I think the basics are there. With more interesting enemies and levels it could be really good.
I found it a odd that the camera zoomed in when you were in the middle of the stage. There didn't seem to be a good reason for it and you couldn't see much, I think I'd prefer it if the camera stayed zoomed out.
But nice game, good job!