Be sure to read the 'how to' in the game, it is very important. Its a simple concept, but requires just a little bit of understanding in order to effectively use Rel-A-Sketch.
To answer everyones question about the confusing controls: It is intentional. I wanted to find a way to control it, but have the controls be indirect enough to make the resulting image look like an etch-a-sketch image.
'g' toggles the small, circular guides
There is no background music in this game. Personally, I don't like background music in simple games, as it increases game size for 20KB to 800KB and I usually just hope the author has included a "stop music" button anyway.