Excellent!
As a huge fan of both defense games and zombie games, I totally loved this. That said, a couple minor fixes would eliminate some of my major pet peeves:
1. Remove ammo on the chainsaw entirely
2. Fix the barricade a bit so you don't sometimes get stuck(IE, can move straight up and down when up against it and not get stuck)
3. Put a weapon find-o-meter on the results window for the day so you know how close you got to it
4. Very very minor, but make it so if you're the only survivor it doesn't sometimes say that you lost a person that day even if you didn't find anyone else
5. The shotgun seems a little underpowered all things considered, I mean while it's loaded it's great but it takes ages to reload, and considering all the running zombies I've taken quite a bit of barricade damage while reloading this thing