Not bad, I got to the level with the tire on top of the pole. I liked the challenge, but the one where you have to land on the tree is tough!
I noticed a few minor glitches, for example when you try to drag the Jump freak, before it's fully loaded or if the mouse leaves the screen.
Faster loading for the levels would be great. I was annoyed that I had to wait as it seemed that it was an intentional delay/animation. Perhaps a quick restart with "R"?