Thanks for the feedback and playing my game. I probably need to clean up the collision layer for the bullets. Thanks for optimization suggestions. I did want to add in some way to keep track of the number of zombie currently active and not generate any more after a certain number. I also wanted to improve the zombie's ability to locate the player/deal with wall collision, but after 3 hours and little progress Saturday afternoon I scrapped what I has.
Haha drivable cars is a bit of a streatch for a one week game jam as I still have family responsibilities, but that would definitely be cool. I wanted to add some fire effects so the blast radius was more clear but I ran out of time.
I have all the set up to add in gun swaps, but for the length of the rounds it didn't really make sense unless I was able to finish unlimited days mode.
I thought about fog first but I wasn't sure how to make it scroll and be random. The rain was so mich easier to deal with.