One of my personal metrics for assessing the quality of a story is its originality. This one takes the cake. I loved it. Horror is psychological. You manipulate the reader and create a sense of horror in a way I've never seen before. The story had to end the way it did. The idea of the inescapable, the mounting irrational assault is what the reader gets as a reward for sticking to the story. And, in earning that reward, the reader understands exactly the desperation and terror of the narrator.

Respect :)