The first problem I have with this film is the fight scene, or at least the end of it. The POV suddenly switches to the bully which to me was a stupid idea, it makes the film look amaturish and not thought out. You could have given the same feeling if you did a top-down perspective or a side perspective, hell, even an over-the-shoulder perspective on the bully! Whenever you make a scene in the future, you should try and think of the different angles of the camera and choose the one that you feel conveys the feeling of the scene the strongest.
Next we have a rather simple but very, very, very noticable error. The funeral house. its just to detailed, it contrasts with the simple animation and makes an eyesore out of itself! Stylizing your animation is vital for a beautiful and flawless production, keep this in mind during future projects.
Well, that's about it. Everything else was fine and well animated, all in all a fair animation, its welcome change to the usual senseless violence or fart jokes that inhabit many other movies. I can't wait to watch part two.