I didn't mind the simple artwork, i would of loved to see more depth in the colour for the backgrounds and characters.
Your animation itself looked fine but I feel as thought you were too scared to let out the grotesque realism with the boy corpse by making the blood and guts flow out a little more smoothly.
The voice-acting was ok I guess, sort of matched your characters a bit, mostly just teh mayor character.
I think the storyline itself of a poor depressed boy get taken through a portal to another world just to get butchered up by the portal itself was a little odd. Especially if the mayor was to have his world be bright and happy for depressed kids. I would of loved to see the alternative version of this without the kid being decapitated by the portal and goes on an adventure through Grossvil then dies tragically, its just an idea.
overall this short animation was quite satisfying, I hope to see you do more animations in the future with much more improvement ;)