The beginning build up sort of seems like a different song, more of the 'villain's theme' that plays before a battle. However, right near the end of the buildup the song amps up the intensity and become final boss-y.
It certainly seems like you were aiming for an RPG Style of music, which I think you were able to successfully execute with the large variety of orchestral instruments mixed with what I think are synths.
Would you be opposed if I used this in an animation someday?
I'll give full credit and everything. :)