Great work on the game! However, it would have been nice to get some background activity so you don't feel like you aren't moving when nothing's around you. Otherwise, full marks!
I did add a star parallax but that took up a LOT of frames - I was instantiating 2,000 circles with the parallax script on it and it wasn't very good so I had to remove it. In the next update, I'll see if I can add an effective parallax.