Pretty Fun!
Just a couple things you may want to consider revising...perhaps allow the ship to gain experience either over time or after each kill that can be used to lvl up the ship to make the weapons faster, stronger, etc. because when you get pretty far into the game its hectic as hell...its fun but its nuts. Also I had quite a few enemies spawn on me and I couldn't notice because I was busy blowing up everything else...maybe having the enemies spawn outside the border first would be good. But these things are just little nuances that I didn't like...the game was still fun and it looked very cool.