First off, well done on making a game!
I particularly enjoyed the movement of the player, especially the solid-feeling jump landing, and the movement of the player's arm as the player rotates, and the sound effects of the gun and the ambient noise.
The main premise is interesting, in that you are defending an area from seemingly endless zombies.
Some post-jam improvements to add some polish to the experience would be to maybe make the zombies have animations as they move towards you, to add some sort of end goal, and maybe some sort of tutorial as the player is just dumped into the game without instructions.
Well done on your submission!
- Ethan