I like the smell of dead zombies in the morning.
Too bad there's no morning D:
Oh well. Seriously, dude, I would have played this game longer if it wasn't by the fact that I had other stuff to do. Game was awesome. I can't say that it's too easy to kill most enemies with a single shot, since I have to reload after each shot (or shots, if upgraded), so it's kind of balanced, until the time that you get to headless enemies who you need like 3-4 shots to kill, having to reload more than once to finish off a single enemy, while hordes of others are getting near as well. Shooting them in the legs should slow them down, make them fall to the ground or something.
I liked the fact that there were different types of barriers, and mines. Grenades were too useful as well, but I'd change them for molotov cocktails, since those explodes at the impact, while grenades should have like a few seconds before a explosion.
Appart from the headless zombies, I enjoyed how the other moved. Looks so cool. I love zombie games ever since I played Dead Rising, so I liked this one a lot. You, sirs, have made a game that you can be proud of.