Not bad, even in daylight this offers a little bit of suspense, but I wasn't sure if there was any real way to "win" this. I found all of the pages but then nothing happened, so I ended up just running towards slenderman.
One way you might make this more intense is to make a sort of maze out of the buildings with a few dead ends (pardon the pun). Not only would that make it more challenging having to navigate your way through the maze while being hunted, but you could add really narrow bits and sharp corners to create even more suspense. Just think about ways you could play with the environment.