Nice work, I really did enjoy this, the majority of the film was very entertaining. The sets and animation were quite decent, and the voice acting was great (especially random man 2 ).
But there were, as rio said, a few technical flaws.
Spoiler (highlight to read)at the end when the city explodes, I felt a bit unsatisfied with just a cut to "several days later" it would have been more interesting to have seen a big explosion or something.
One other complaint was that all the characters (good or evil) seamed to have a black torso and red arms, it made me a bit confused as to which "faction" they were on.
Overall I was impressed and hope to see more from you soon.