Lovely, I count 6 different asteroids
- 3 static ( round, stomach and boomerang shaped)
- hellixes
- big boomerang
- worms
My high score was 75 seconds
The move band is a great limitation, a quick improvement that would be great is colors, use a cyberpunk pallete (neon green, neon purple, cyan, black for background)
A not so quick improvement if you want to extend the game is upgrades and a pistol so I can shoot the asteroids (different asteroid hp, multiplying worms, so on so forth, you know how bullet hell games go.
Great job