So it's a first person walker.
You know, I might actually be a market for first person walking games, if they walked around anywhere worth looking at. Why can't I go on a tour of Prague instead of wandering around forests and dirt roads? Because there's more trees and dirt textures in the Unity Store?
I highly doubt you get Olly Moss on your team and then use some free bullshit textures in your game. C'mon, son.