Absolutely perfect.
I'm not even going to try to offer any constructive criticism to help you improve on this, as this, in my opinion, needs very, VERY little improvement.
The length itself is an amazing feat, and I can tell you're very dedicated to your work. I've actually followed quite a few of your animations, and I'm always impressed with them. Excellent story in this one, too. :)
You have a real gift, I'm telling you that right now. I love this piece. The audio sync problem that only became evident near the end didn't alter my opinion on it at all, I was so wrapped up in the story unfolding before me.
Beautifully, beautifully done. :)