You really captured a great atmosphere and it's really impressive that everything was created in just 48hrs, I like the idea of having the two different enemies that you can only identify with the same tools that will allow them to find you, but, I think perhaps it's a bit too punishing in that regards, as soon as any of the zombies got sight of me that would simply chase me down even after turning off the tools and running, and the range of the sound "sight" made it so unless I was spamming it I'd walk into the zombies before I could see them more often than not.
Overall I think it's a great idea and the presentation is top-notch, really impressive work!