Fun
This game was pretty fun and interesting. I had a great time playing it, but have a few suggestions. First, I would recommend having a sound effect for when you shoot a point box. A little chime would work well. Also, it would be easier to identify when you were hit if there was a sound effect (like an explosion) and the object that hit you blew up on your ship.
I also enjoyed the 8-bit "Still Alive" from portal.