I'll have to agree with Karsys, I can't understand why this movie hasn't got more views or higher votes.
Really, if there were enough stuff to nag about, I would do so, but I can hardly find anything bad here. Right in the starting sequence you showed us so much details in this Sci-Fi city that I was already in the perfect mood to watch this. Easy to see that you put a lot of effort into this, and it worked out fine.
That you didn't use any voice-actors isn't a problem at all, the neat sound-effects and great musicscore tell the story for each one to understand. Funny final scene, good storyboard, very well-done animations. Only thing I can come up with is, maybe some NG-user find this to childish?! Hm. Whatever. I'm 35 now and I really liked it!