A little noisy
It's got a good beat, but the way that this piece really start to struggle is hwo it seems to be fighting against itself. I can understand with the invocation of things like Great Cthulhu, you're going to be going more than slightly mad with a piece like this, but at the end of the day, there are things that can be tidied up within.
Perhaps you could give us a slightly more surreal imagery when you get to the really messed up part. Perhaps take some of the bass out and mess with the beat, giving a sense of impending doom. You know that it's coming, so put a 'calm before the storm' in there and then hit us with something big, loud and scary, since that's usually what happens before the tentacles reach out and grab you.
It's sinister, but not quite sinister enough.
[Review Request Club]