It's good
You explain in an easy way, which is good for beginners but I think this helps some better animators, too. The characters aren't very hard to draw, though, but it's good anyway.
The drawpad: Good idea but everything you draw just gets weird :D It's better to direct use flash then.
The possibility to change track is good but you should include a "no music" track, too. Some people may want to turn it off completely and listen to their own music. Except that, good interactivity! You can go to which page u want in just one or some few clicks.