I like the concept and the game is pretty fun to play! It also felt very polished. My only issue with it was that it was very easy. I could easily have kept going forever; I only got hit once at the start when I wasn't used to the controls. I quit after 5000 so I'm not sure what the high scores are. I think some enemies that shot projectiles back at you might have been fun.
Overall, though, great work! :)