I really like the premise of this game, it's pretty unique. XD
Graphics are good. Audio is a bit silly... but it's funny and it fits. I really like it. :D
When I started, I thought that the city would use up the guts I placed into the bins. I was confused about why the power kept going down (the bins were full, so they had lots of zombie guts to use, right?). I did not know that I had to move into the next area once the bins were full.
The control of the main character can be a bit frustrating at times. I find the jumping to be a bit sluggish (I jump up, it takes a while for me to come back down).
If a zombie is on a ledge above me (like the steps in the second area), then I have no way to shoot it unless I get closer to the zombie and risk getting hurt. It might have been better if I could jump and shoot?
In the third area, I filled the bin on the left, then I went to the right side area and there were about four zombies on the ramp downward. I had one heart. I couldn't target them (similar to the situation above), so the only thing I could do was try to jump over them. I did not succeed... my character died.
So I think the level design and/or gameplay need a bit of work. Otherwise, it's a very creative effort, so good job! Thank you for sharing your game. :-)