I like the ominous mood and instruments at the beginning. The intro didn't need to be so long in my opinion, though. It certainly is dark and engaging, although dubstep isn't my favorite genre. I like the variations on the bass. That muddy, distorted bass and the effects around 1:53 are interesting. It's well-structured and the transitions were good. I like how you end it similarly to how it begins. It's engaging and creepy. I like it! :)