A Good Start
The art had a lot of emphasis put into it, but the animation (movement) lacked.
I enjoy walking dead stories, and other than a chemical spill or radioactive explosive, they don't need much more than that for the story. However, there was much to be desired for this because it had a feature-length plot and ended so abruptly. I wanted to see zombies eating flesh & brains and getting blown up and shot.
Still, it was entertaining for its length and had effort put into it.
One last thing - stay away from shape tweening (like when the monkey turns into a monster) until you know how to use it properly, otherwise it looks really bad.
-T0MMY