All I got done is a one-screen prototype. The final thing would involve a multi-screen base that you disable, then enter inside.

There are three shot sizes. When shots of the same size collide they create a bigger shot.

I was going to make some kind of asteroids game. I tested it before I had the screen clearing every frame, and ended up making a game around the drawing with game objects.

Fight the evil Space Head (you can't win)
Destroy the missiles before they hit you.
Or you will die.

Its like Asteroids.
Left/right = rotate
Button 1 = shoot

Drifting in the cosmos, hoping for rescue. The cosmic drifter.