Could use some more difficulty for the levels, i managed to get rid of pretty much every level just by drawing the platform very quickly, thus spending less pen power. The gameplay was simple and a bit boring at times, the music was decent (eve though it was a loop it doesn't get old fast like a lot of other loops) and the graphics weren't particularly bad but they weren't something i'd admire either.
I like the notebook look that you gave it, it makes us feel like one of our doodles has gotten a life of it's own and he's trying to escape.
Keep working on it and this has potential to become much better.