Great concept!
I loved this hand drawing idea that's used so much now; it just gives the whole movie a coll Nior felling to add to the already noticeable creepiness. I think you should take advantage (for your next cartoon if so) of all the features flash has to offer: static backgrounds, static drawings, so on and so forth, to make for a more visually pleasing and easily animated (for you) experience. Hope you take note of these suggestions!