Use WASD or arrow keys to move Scratchy, the main character. Press space to start erasing, then space again to stop. Press Z and X to decrease and increase Scratchy's speed. (Note: At speeds below 4, erasing doesn't work so well.) Use the mouse for an eraser. I hope you like it!
This is just a basic program I put together at a TriValley CoderDojo meeting: http://scratch.mit.edu/studios/258689/ All sprites drawn by me. Based on this program, by KrazyKoder: http://scratch.mit.edu/projects/14171007/