Wow, you use so many chordal elements here: dim5ths, complements, major 6ths, and so many more. The flow of the work was gorgeous, and I can't even criticize the thematic development. The audio rendering was great, seemed to mimic how a human might play this.
A couple of critiques:
You used so many chromatics (not a bad thing at all), it makes me wonder how useful a key signature actually is in this piece.
The distorted waltz at 184 didn't feel like it belonged in this piece. Perhaps if it had been foreshadowed earlier...
The ending, to me, was a bit "meh." I expected either a loud crash or quiet slipping away, not just a simple accel.-rit. coda.
But those are really just minor quibbles. Overall, I enjoyed this work immensely. I'm used to listening to works that smack of some other great composer (Mozart, Chopin, etc.) but this one sounded unique. Great job pulling this off in your own voice!
Thanks for sharing.