Interesting.
I like the beat for both phases of the song. Creepy, and fear inspiring. Although Ozzypig thinks the theme changes from the first phase to the second, I believe that it's something else. Both phases both have a "creepy" feel to it. The difference is that the first phase seems like someone fears something and is running or hiding from it, while the second phase is the person trying to overcome their fear and face it. It could also be that he's hiding, and when the song changes phase, he's been found, and he starts running. That's just my interpretation though, so I mean no offense, Ozzy.
The song builds up nicely, and I have no problems with the bass. This song does have potential to be longer, but I've never rated anything on shortness, so this gets a solid 9. Good luck with your future works. :)