Sketch that Etch!

This is my very first game that I've ever not given up on in the stage between clicking "new project" and typing anything. This actually came about because of a typo in coding in Game Maker studio that left the bullets stationary and I thought it kind of looked like an etch a sketch, so... I made an etch a sketch.

Controls:
Backspace - go back to main menu
WSAD - control first hand
Arrow Keys - control second hand
Space - Shake it!(start over)
Escape - closes the game
M - mute

Hint: if you want to start from a certain place, space retains the cursors position but gets rid of the lines.
#other