I like the concept of this. Game play is a little bit odd for me for some reason. I think its because I keep accidentally buying ladders instead of swapping out weapons. The random city effect is nice, only problem I had was that I found Anna within the first 3 minutes of game play.
The idea of the mechanics for the game is nice, I sort of wish that the storyline was somewhat in depth. Also wish there was more of a soundtrack. The piano/violin song is good menu music, but drives me nuts trying to play through the game with it playing the entire time. Maybe if you replaced it with zombie grunts and maybe background noises and such. It would help build up the atmosphere. Overall nice job none the less.