Nice Work.
There is that big bug on survival mode but that's about it. Defence mode is right on, someone finally put a challenge into zombie games. I don't know why people were complaining about the prices, I think they are fine. *TIP* I have to say the assault rifles are the most reliable guns in this game. The capacity is decent, reload time is fast. I'm in defence mode right now with the 3rd assault rifle and im pretty much invincible yet it is still fun to play.
Overall it is a game I think is one of the best zombie games on Newgrounds.