I agree with Natan - it looks amazing. The only very very minor thing I see is it's a tad overreactive. The heads seem to get extra velocity and movement. In the game though it's probably more fun to have stuff acting in a slightly exaggerated fashion.
And the part with the zombie crawling back up is pure genius. I can't wait to get a free pro....I mean buy the game when it comes out. Are you going to get it out by Halloween? You would have to submit very soon though with the 2 week review times.