It's not quite like Glass, but that's okay, because this is still really, really good! I liked this piece a lot. Lots of cool turns with the ostinato somehow never really getting boring because you switch up the orchestration so much to accommodate. I think some of the bigger sections seem like you're stretching for ways to twist the feeling a little too much in spite of this fact, and that's why it sounds so different than the rest of the piece. The ending also could be extended a little bit.
But that's a lot of nitpicking. The Db major was such a wonderful moment, as was the steady build using nonfunctional harmony. Great work, really.