I love the graphics and the invisible zombies idea. I just like the dark and moody theme. I do not like the dialogue screen, it was long and I had troubles following along with the voice acting. The controls could have been better, I was hoping there would be sprint in a game like this but I understand due to the time constraints. I did waste a shot due to the control button. I also have problems with the hitboxes but I understand that due to the time constraints but you should take that into consideration since you/your team went out on a 3d game, I tried shooting the head but every shot missed the head though I clearly was standing next to the enemy. But I figured it out due to trail and error that I needed to shoot the body. I think the reveal gun and pistol wasnt obvious enough, I spent the first half of my time playing confused as to why the "ump" wasnt killing the enemy, I suggest making labels or something idk. I killed the bosses in 2-3 shots each and I did not feel satisfied killing anything, there was not much feedback. Then finally the ending was not obvious enough to me. I ran around the end of the map for a few minutes until giving in and said to myself to just review the game,
Overall though I enjoyed the idea of the game, it has potential! Good job! :)