Good graphics, sound when shooting.
I agree with the comment on GoL, the zombies move too slowly to be scary, though I was scared cos one popped right near me when I was grabbing stuff out of a crate near the trees. But then it was so slow like it was standing still, so it was easy to kill him.
Not sure if the crates where you start out had items in them, but I thought they didn't cos at least one didn't. Would be nice to be able to discern if something was a collectable without trying to see if there is a hand icon. Some collision problems/jitter, and weird lighting during night, making it look like all the texture detail was gone.
I think you already know what other stuff you need to improve on. Great job! Overall a well done game on this game jam! =)