Wow that was fun :D Art, design, music everything is great! Completed in 7 minutes. It feels responsive and fun to shoot zombies. Taking corpeses to vending machines also felt fun for some reason :D I gotta say you guys did a good job using the theme. The only negative i can think of is after some point it feels a bit repetitive. Maybe more guns and enemies can help with that.
Overall loved it, I applaud you guys. Well done!