The basics of this map are good. However it lacks in many places. For example your income system carefree people (like me) will screw this up and built only houses leaving them without any metal.
Their are also things without any use and far worse without description at all. For example what is the Hunter strain for it seems to do nothing. Then that final battle thing which states use it once all zombies are dead also does nothing.
Then the Turret upgrades you have to try out which of the turrets is actually useful.
Another thing i don't understand is why all buildings take so much space it will force the people to built on open field. Another thing concerning the Buildings are the forges. Why do you replace them once build? This way they take even more of the too limited build able land.
Horde Zombies are weaker in terms of attack damage.
All in all i like the difference this zombie map has. I mean that you are unable to built any zombies and just have to keep killing to get more. Keep it up