Surreal!
Well I loved loved loved the style. The characters were unique and awesome, yet the voices didn't fit them one bit. Your animation, what there was of, was pretty good, like the flying milk carton. The scenery was awesome with the mix of colors you used topped with the black paint and/or pencil tool. What I really had problems with were-
1. There was no plot, like at all, and what there was of I really couldn't understand.
2. The backround didn't seem to fit in that well although the blur effect of it was really sweet.
3. Third and finally your biggest problem! SOUND! It was terrible, which is REALLY going to effect your score largely. Get a program called Audicity to help you with that.
Overall I say you made yourself something to work with here. Great style, you should keep that up and maybe edit your characters and make them a little better. Fix the sound and you could make something AWESOME. I still gave you a 5, though it doesn't deserve it... yet.