Can't deny, it's definitely good...
To those asking why it's #1 well, it's hard to find fault in this movie. It's well animated, it's extremely cute, but not in an annoying way. It's suitable for all audiences and can't offend anyone. Most of the animations on newgrounds have something that will piss off somebody, but really there isn't anything for anyone to complain about with this one.
The reason it has such a high score is simply because there isn't really anything you can take points off for. It's well put together and animated, the music is perfectly timed, it's stylish, and it leaves you with a smile on your face.
I give it a 5 and hope to see more from the creator in the future. ^.^