Nice use of the assets to make an interesting mash up of genres. The music was good and gave me a bit of an 80's MJ Thriller vibe from time to time.
I think some more time needs to be put into the balancing, as it rarely felt like a small increase in stats would outweigh just buying 2-3 extra turrets. Also whilst I really appreciated the fast forward button, I still found myself disengaging, and just waiting for the round to finish each time. I know its part of the TD genre . Perhaps being able to relocate turrets could help.
Going forward I'd love to see more turret types and a little more feedback with regard to the zombies taking damage.
Would be really interested to see where you took the game with a bit ore time, as its a cool concept. Good stuff!