This was awesome! I honestly felt like I was playing some good old Nazi Zombies from back in the day.
Visually - Loved the environment, very cool choice to set it in an airport, the weapons and zombies look nice also. Cool gore effects! Very satisfying when getting headshots.
Music and sound - I thought the sounds were very good and tied well to the gameplay. Music was great as well! It kind of put me in that arcadey-shooter mood which I think is what you were likely aiming for.
Gameplay - the shooting felt satisfying and I could definitely feel myself getting better at headshots the more I played. The one thing I would have liked is maybe some more weapons but I am kind of a hypocrite for saying this since my game only has one type of weapon. It just felt like as the zombies started to pile up I could have used some more firepower to stay in the fight! Let me know if I missed something there.
Awesome job and excellent teamwork!