Noooo, I’ve passed 100 lines, not minimal enough!

I decided to do a space game.  My criteria is the minimal amount of features to make a cool space game for me, which means decent physics, and non linearity.  Beyond that I don’t know.  Here’s the boring minimal starscape:

And here’s the entire game so far:

Has particles, flashy stars (I don’t care if they don’t twinkle in space, I WANT TO SEE THE TWINKLY), physics, and guns.  Pretty good for 100 lines of code, but I could do better.