Absolutely superb. I don't think I've seen something so in depth and committed in the history of this site.
The sheer quality of your animation is inventive and daring. You haven't shied away from the more difficult angles or style of background with your animation, which a lot of animators can do, especially with such a long animation. It shows commitment, and it allows you to capture the repressive mood of the animation absolutely perfectly.
Despite the very little dialogue, you've managed to subtly reveal a detailed history and strong understanding of the two communities within your movie. It wasn't direct, it didn't have two people sitting around for 5 minutes explaining everything. You took your time and unraveled a imaginative world you've invented.
I adored the music, especially toward the end, it perfectly enhanced the dreary and sinister mood of the movie. Nothing was over the top and it perfectly complimented the characters and environment.
This is the sort of movie and the sort of story I would pay to go and see, and I don't think I've honestly been able to say that about any other animation on this site before.
Furthermore, to anybody who loved this as much as I did. There's a wonderful series of books called Uglies by Scott Westerfeld that approach a same subject. Pretty city and sinister motive behind those who run it. It's a bit teeny, but it's a good series.
Anyway, enough of that... phenomenal work, I want to see more.