The collisions rectangles of the asteriods, black holes and the space ship seem to be a little too big, often my ship would be destroyed even though it didn't seem to collide with anything, I would advise making the collisions smaller and more precise so as to not frustrate the player, and also add a button to restart the game after dying to make it easy to try again. The idea is interesting though, and I like the music and simple but effective graphics. Keep making games and learning!