Gravitaxis ++ Awesome
I really liked this. was very well animated and the music was also great.
Dunno if I've got the wrong end of the stick here but I think gravity was "reversed" because the world was inverted. i.e. everything thats normally on the outside is on the inside with space at the core. (?)
I'm just going by the picture in the book the girl is holding at the end.
One Million Pageviews 
Angry Dog - Legal Lobster