Wow, that was cool! The animation was really damn good for something made in 3 days and I liked the style, it reminds me of regular show a bit. The concept was certainly interesting. Creepy weird shit like this has been done before, but this still managed to creep me out. The slow build-up and then the entirely unexpected Onion Child, and Roy's slow descent into a mad abomination, just wow. However, the big flaw with the movie is the sound. I barely understood anything. I think you tried to hard to get a creepy weird voice and you made it too quiet/unintelligible.
Keep it up, man! I'll be following you (that sounded wrong)!