Quite a fun experience. I also love that the player can feel smart at first and be like, "look at me, the mighty spawn camper, my gigabrain is not for eating", until they finally do get overwhelmed by the zombie horde. Great integration of sound and animations. Weapon recoil also feels good.
Theme interpretation is ok for me - a world in which a Zombie apocalypse has started is definitely going to be lacking many things quite soon, if it isn't already.
It would be great to play an extended version of this game at some point.