Fantastic foundation here. If click and hold firing was implemented, it was not working for me when I tried out the demo. This was obviously rough when I picked up a weapon I expected to be fully automatic and had to spam click instead. The map has too many wide open spaces. Think back to COD zombies - you feel almost cramped and claustrophobic in some hallways. This gives opportunities for the player to slip up and get trapped with enemies. You made some very satisfying hit markers and death popup indicators, maybe the same could be done for the wall buys and door opens to give the actions more oomph. Keep it up, this will definitely be a fun game!