Good work. A few tips.
I could see your drawing and animation skills increase as the movie advanced. I think you'll get better and better if you keep at it. Some kind of background would make it look better IMO and the file is WAY bigger than it should be. I suspect it's the sound compression. An mp3, layer 3, 44100Hz, stereo, 64kbps would cut the file size in half and would'nt sound much different.