In my opinion, I think your choices of tone and instruments create a very soothing atmosphere. The only thing I worry about is the overall structure. I understand where you're heading with the build up, but I was disappointed to find that there was no direct climax that awoke the "man this is epic" kind of feeling.
I would like to hear something more dynamic and nuanced. As DuttonsaysHi said, you could write a chorus and give the listener more of a red thread to follow. Sadly, the static ways of the song structure traps mentioned thread in a dark tunnel; All that the listener will see is thread and the inevitable and predictable end. Tear the tunnel apart and vary the path of the thread so that one can feel and see more of the environment around them, instead of limiting the songs potential by not variegating the musical structure.
Think of this till next time, and I'm sure the song will be more interesting!
However I do think you did well in the instrumental sonority of this song. It blends together very nice.
Tell me if you make something new!
Take care.