Nice
Fun game. A bit linear (same enemies and weapon over and over again) but fun nonetheless if you want rampage.
I liked the leg-break touch. In case a zombie rush would come, shooting the legs of the ones from the back would give me time to kill the ones from the front.
Graphics is simplistic, but the gameplay takes your attention away from that.
Settin it on high makes the game look acceptable.
Replay value is kinda small, cause of the action being the same thing, but playing it at school/work for a few mins when your teacher/boss is not looking is a perfect choice.
The idea's good. It would be fun if you could use the other 2 people for someth else except pushing the bed and pushing the elevator button only once(then again, maby they're too scared...).
I liked it, great job overall.