Fun game, it had a real claustrophobic feeling and despite the simple art I felt real tension when trying to avoid the zombie for the 3rd or 4th time. Both art, audio and UI are simple and clear.
One thing I felt missing is some indication of where or how close the zombie is, either by visuals or audio, like extending the range you can see, improving visibility a little bit in the dark areas, relative position of the growls or some random noises that indicate in which direction and how close it might be. It was nice that it got me suddenly, but at times felt unfair that I had to real way to avoid it, just react quickly when it was already very close.