I very much like how it's building so far. (as of WIP vC) That dark-ish intro (the character of the first 20 secs or so) was a surprising idea to me, but it totally fits, so great job on that. The build that follows seems great, though the real tough stuff is yet to come. Good luck!
P.S. Sorry I didn't post here sooner. I subscribed to the other thread, and the email I received quoted me your post without the link in it for some reason, only upon revisiting the forum did I realize you'd linked a WIP thread.
EDIT: @#2: You can hear the source tune here Prisoners of Fate