Any sound slowed 700% is creepy. It's just the human brain associating high-pitch sounds with fun, children speaking,, bell ringing and other "nice" sounds, while low-pitch is of thunder, big animals (predators) roaring, otherwise associated with danger.
I listened to it again, you're right. Sounds like a horror movie theme, maybe that's what gives the creeps. Although I have to agree with many others in this thread: it isn't that creepy, I heard much better ones.