Hey Peter!
It sounds like you've gotten some sound advice already, and as this was posted almost a year ago, I'm curious to how your writing for theme and variations has evolved. Some of the things I would say would be echoed from the above comments (busy theme, slow/fast tempo variations, etc.), so I won't fill the post with redundancy.
One thing that kind of caught my ear, and although SSC mentioned this, I'd like to discuss it further, would be the flow and form of this. This could be just a style preference, but I've never been a huge fan of the cadential endings for every variation. Using @Ferrum's recent piece as an example, he went to great lengths to blend and transition most of his variations to flow, giving theme and variations a seamless and smooth form. Maybe that's what you weren't going for, and by all means your piece is wonderfully crafted as is, but it's something I've always admired about taking the form to a different level. I just happen to prefer that over the stop and go...ness...of the cadential endings and pauses of the style you went with in this.
I really like the language you used, kind of a tonal yet late 18th century to modern dissonance added in. I'd agree, that you took the harp style variation and ran with it to create a final ending. But don't let that stop you! You could apply that same technique to a few of the other variations to give a sort of section closing statement to certain spots as well. Or perhaps a build in dynamics as well. I applaud you for having such a diverse and dense theme, maybe that wouldn't be possible. But, as said before, I think the simpler the theme the more you can manipulate dynamics, density, and overall variance to create wider ranges of styles to pick and choose when they might be best suited throughout your piece.
One thing I thought was cool was how you labeled some of the variations. I thought that was a nice touch, and it gave me an idea of what you were going for with each one. Why only some though? If I were labeling some, I'd keep it consistent and label them all for continuity purposes, but it's not like what you did was a bad thing.
With all that said, you continue to impress me with your knowledge of harmony and counterpoint. And to think you write all of your initial drafts on paper? It's takes a lot of talent and a great inner ear to do that, and it's something that I really respect and look up to about you. Kudos to a fine work, so sorry that I missed this one! I'll periodically delve into your "about me" section to hopefully find some more great works of yours that I haven't had the pleasure of listening to. Thanks a bunch for sharing, this was a real awesome piece!