This was cool. It has potential, I think. The tension the game had with the camera was pretty intense for me. I guess mainly because it got harder the worse you performed. The silence kinda became eerie because of that, too. And the bullets (which had no punishment for spamming them aimlessly) were actually being not spammed by me because they kept breaking the silence. I think that could be a feature. Like if the zombies reacted badly to sound and stuff.
It's a good start. Cheers!