I see you're using a top-down based control scheme, but you seem to be using an over-the-shoulder camera, which makes the player character extremely difficult to move. I feel like if that were fixed, this game could be a lot more fun, as I had a decent time shooting zombies anyways. I also would suggest that, if you're using a top-down system, you allow the player to shoot in directions they are not currently facing, since top-down can be a little restrictive.

Sorry, but the controls make it unplayable, you better use calssic WASD movement may be