Fantastic!
One of the best, most addictive games I've ever seen on Newgrounds. I've almost got absolutely no criticisms: everything was well thought out, and the game ran really smoothly. Technically, I think there's a bug somewhere in the script - the number of citizens listed as idle under the people icon at the top was often incorrect. Otherwise, didn't see any problems. The only thing that kind of let things down was the animation that runs when the zombies attack - could have maybe spent a bit of time tidying that up. But it's a small thing in an otherwise cracking game. Well done!