Extremely creative implementation of the theme(And as a game in general!) After I replayed the game again, I really loved the overall gameplay! I got 945 after a few tries... I really couldn't manage the next planet with my rotational speed haha. Overall a really nice mechanic.
The gameplay is a really well thought out and implemented idea. I really liked how the bullets can hit the player back---adding another factor to the gameplay that would have been easy. In addition, I loved the pixel art style as well!
One small suggestion will probably be a different choice of font---a font that suits the visual theme is a really big upside for a game!
Great job!