I found your progress updates fascinating, I was really looking forward to seeing how it would all come together at the end. Pity you couldn't get more of a "real" game, but the technical feat sure is impressive. Well done !
It's a shame you didn't have the time to implement more than you did. The platforms in the first level had an entertaining likeness to the platformed world of The Dragon Hunters (the CGI movie). I wanted to suggest you followed that style but feared it might just bring it towards another type of Super Mario Galaxy. Still, the notion of a world, fragmented by an ancient cataclysm, its pieces still floating in the atmosphere... intriguing.
I'd definitely suggest you should push it further.
Looks very nice, but it's obviously rather unfinished. Most important would be a restart key or automatic restart when you fall down. The jump height seemed to differ between the first and the other levels.
Too bad there wasn't more game, but congrats on submitting! :)