Your map is very well made and all, but it could use a bit of optimisation.
a horde of zombies will start spawning when I am literally right in front of it. Often they all disappear after one or two seconds.
Also, a lot of the buildings are unfinished- they have absolutely to furniture in them!
I noticed that the bottom left regions are more 'finished' than the other regions.
They have too much item. Way too much. It makes the game a lot less fun..

Maybe I'm being over critical, but yeah. Just saying.