A few notes of intersest
Overall: Okay
1) Why do the assumed protaganists look like they're either naked or scantily clad. They look poorly animated compared to the antagonists. Like there was not a lot of detail or thought put into them. The odd non-realistic coloring doesn't do a lot for my "getting into it". I'd like to see them with clothing and more detail in the facial region. Actually animating them fully would be good too. The moving the drawn image is ok, but it would be better if they're animated.
2)The quality of the video looks very poor. Gives it a blurry youtube feel. Like everything is out of proportion with the default view mode. You should look into improving the quality of the film.
3) The zombies had barely any film time and didn't ever show up in any combat scenes. More of them would be nice. So far it looks more like a elite military team vs. a ragtag band of urbanites, not a zombie flick.