You don't often see FPS games in jams. Well done. Good heart-pounding music. I liked the art style. As someone who has been playing FPS games since Wolfenstein 3D, this reminded me of Duke Nukem era shooters.
It was unclear when you actually hit a zombie, especially when they were farther away. At first I thought I was missing even though my reticle was over their heads, then I realized they all take two hits. It would've been nice to be rewarded for headshots. At one point I ended up in a building with a red television and couldn't get out. I couldn't tell if this was intentional or not, but obviously I ran out of ammo and died. Also, I found the gun itself too floaty when you're moving around and aiming.
This game has a lot of potential to be really fun.