The horror in those layers came from trying to distinguish the scares created by the director of the film (i.e. "fake" scares), and threats from outside forces ("real" scares). Early in the game we attributed most of the surprises to the director, even though in a few cases we were wrong. Later in the game, everything was real whether the director had anything to do with it or not.
The other source of excellent terror was the monster of the night: the Mi-Go! It's too bad it's a few months late for the HPLHS competition which asked the question "What are the Mi-Go up to in the hills of West Virginia?"
In any case, it was a lot of fun to see how the final scene played out. My character, having gone from pretending to be the leader to the now survival-driven boyscout, saw the Brain Case as the only hope of escape - especially after both of his arms were clipped off at the elbow by the Mi-Go. Becky fought to the end, getting scissored in half by the giant claws. Zack similarly fought to the death.
The ending scene was great. Fade out on the cave of carnage and fade in an off-colour, grainy image of the Mi-Go adjusting something like it's leaning over you. Then the Mi-Go turns and walks away, while my character's voice screams "no! Wait! Come back!" The camera pulls back, revealing a brain cylinder, newly plugged-in, and the monster walking away down a corridor lined with similar objects.