Pretty Cool.
Overall, it's entertaining, but I have a few problems with it.
First, I find the voice acting bad. It sounds kind of immature, and the grandpa should obviously sound much older.
Second, you should've mentioned which New Haven. As it so happens, there's a bajillion New Havens in America. The most well known one is probably New Haven, Connecticut, where Yale is. Because I know about that one, it ruined my enjoyment a little bit until I guessed it was some other New Haven. It looks like it's one of the ones in the midwest somewhere, but the kids in the movie sound kinda California-ish. That's another problem with the voice acting.
Compared to voice acting, the animation is very good. More precisely, the characters look great! The story is good too.
Thanks for the effort!