Well suited to be a level theme, and one that would make me thoroughly immersed. I wasn't sure what to think about your repeated chords but then the middle section came along, and it took my breath away.
I love your risers, your arps. Not sure I feel the rest of the piece the same way, except in sections. Listening to it as a standalone piece would be harder to me than, say, if I were playing a level in it with other sound effects and things.
Seriously consider joining Pixel Day in January next year -- I think you have what it takes to win!