Hey there, fellow lone wolf!
Nice stealth game, trying to get a zombie out in the open to start our own zombie apocalypse :) I glanced at each difficulty level, played on easy, and finished the game in my 2nd attempt on easy.
Now, I see some issues within the game. The character is really, really slow (even for a recent undead). The camera system is very bad: It is placed far too low, and far too frequently, we either have something huge between us and the character, or the camera zooms in far too much into your character; both resulting in we losing sight of our surroundings.
The core of the problem is that your map is far too tight for a 3rd person game. I suggest, if you intend to keep it as a 3rd person game, that at least scaling the map 4-5 times bigger than it currently is, and adding some spacing between all those environmental clutter, so the camera won't snag on things as often. It will also enable the character to move a little bit faster, thus giving the game a better pace.
In addition to the above, you can also move your camera above a bit, and have it point ahead of the character, instead of on its head; so we can get a better view of our surroundings.
So, congratulations on your game submission & keep them coming! Cheers!