The game is pretty enjoyable, I think the graphics stand out the most, the game looks amazing, although there is no music in game, the gun sounds are ok.
The gameplay is brought down by all the bugs in the game though, and I'm talking about the really obvious bugs here.
Pressing R will make you reload your magazine but not decrease from your extra ammo, and it can be spammed to skip the reload animation, and you can even reload while still firing your gun. And there are rooms where the zombie AI can not enter and will just stay in front of the door, waiting for you to kill them. These two bugs make it really easy to just camp in a room where no zombies can enter with infinite ammo. Also, the zombies will damage you if you just bump into them, not after their attack animation.
Fixing these bugs would have made the gameplay way more fun. But bugs are of course expected when working in such a limited time. I wish you good luck in this game jam :D