Lol, while trying to scan the QR code on the wall of the clothes store in uptown, a horde jumped out of the ceiling and almost killed me. =D I managed to scan the QR code, it led to the same page as the link on the paper, pretty cool.
I'm assuming this is a test/prototype, but it's still quite good for what it is. A game like this where you progress through levels, and can buy upgrades and new guns would be very fun, I think. Pretty much my only complaint is aiming the gun should be easier. I'm interested to see if you do anything more with this.