I made this game in a couple hours with original art. You and the asteroids you have to avoid can wrap around the game screen by reaching a certain distance from the origin. Your score is the amount of seconds you have avoided being hit.
For me about 40 is my high score. Enjoy. I will likely update, do you think the physics need a tweak?
I tried this out and worked out w,a,d moved the ship but couldn't find out how to shoot
When looking in the code, I couldn't find anything that did any shooting and realised that it was just about avoiding the asteroids
Which is fine 
But I can't, for the life of me, see where you test for keys a and d and do the spinning - where is the code that does that?
It's in the RM variable. It's short for Rotational Momentum. It's handled alongside the movement code.
i see it now
I'm planning to make a new, more unique game.