Art: not at all bad for an early piece. Backgrounds could use a little more color.
Animation: Props for going with frame-by-frame, but it lacked fluidity. Work on it.
Style: I don't really see one yet. It's developing.
Story: A little cliche, but it was entertaining nonetheless.
Sound: Muffled, but clear. Voice acting was decent.
Overall: 3 out of 5. I had to dock half a point for the lack of a preloader at the beginning and a stop function at the end. But you've definitely got a good thing going here, and I look forward to seeing more.