I wanted to see what would be different if I followed the course, but created the game as a 2D game. I apologize, I am not an artist, so it looks a little rough, but I’m happy overall with the current state. Check out gameplay from my game:
I would still like add a lives system so you have at least 3 chances to complete a level before starting over. If you are interested in trying it out, play it here:
Controls:
Space: Thrust
Right arrow: Rotate RIght
Left Arrow: Rotate Left
Level 7 has some random behavior and might be to inconstant on the difficulty. If you would like to try level 7, try hitting F1 to enable debug keys, then C to toggle off unfriendly collisions. Should allow you to reach that level fairly easily.