Ahh...its all in the chord progression...
Stated in a different review, it seems that your prominent genre is spooky classical music! Everything sounded good in this short little ditty, the chords sounded evil, the suspense kept rising with every chord, and the chords themselves were kinda...weird. anyway, the song could be redone with some other sounds put in such as more brass (esp. some low brass), but I like the fade away at the end!
---The Fair Reviewer---
Your right about the progression; the notes move in semitone steps away from the centre and when they get far enough away new instrumentation starts the process again while the original group keeps moving. Good point about the low range though, hmmm. Low brass, nice idea.