You've put together a fantastic concept and told a far-reaching tale through your tracks. Your music is grand and sweeping, yet somehow gentle as well. I think "The Sun of Water" was my favourite group of tracks, in terms of its mood and choice of sounds/instruments.
My only recommendations would be to let the drumbeats hit harder for greater heart-pounding impact (eg. in "The Final Battle" tracks), and play around with the melodies and chords a bit more so that you sometimes surprise the listener.
All in all though, a lovely soundtrack that took me on a journey!