Well. By the sounds starting at 0.55 your going for "Creepy" If so It didn't really work to well on me... However the song never got boring. The Tempo increase at 1.36 with help with the creepy feeling. But at that climax you'll want to go a bit stronger at the end. It just doesn't scare

Lemme Point you to a song I know that might fit the bill http://www.youtube.com/watch?v=wi1A8B u9cvI
This might give ya an Idea of what i'm talking about. Hope it helps