Very absorbing and interesting game!
I liked this game very much. Not because of its gameplay or graphics, like you all people are trying to judge by. I liked this because of its idea. As I said, this game seems quite absorbing to me. I can say, that I enjoyed this game more because of its plot than gameplay, I always wanted to see the continuation. I do not know why the rate is so low, I vote 5 and I believe that this game worth playing and enjoying. I think, probably, people would liked it more if you'd fix some things:
1. I started to enjoy the game only after second level, and until that time I was about to leave. First two levels are way too hard! I bet, that more than 70% of folks, who played this game leaved before reaching the third level.
2. You could make the gameplay better. It was a bit hard to control the main character. I mean firing, first of all.
3. It is a bit repetitive. And there are too less kinds of zombies.
I recon you got to start working on continuing of this game! People will like it, I promise ;)
Oh, by the way, the soundtrack is really great!
Good job!