You (might) know how I am about world music, so let's get my punk ass a review in and get it over with, haha!
First things first, I do enjoy your composition, it doesn't really have any boring parts like some of the orchestra songs on here, where it sounds like they just wrote it while on the loo. Your compositional use of the dan tranh is commendable too, good show! Is it endearingly special, though? I think I'm going to have to say no on that. On that mark your 15 hour sprint shows.
The feel of the song, I'd say, does not really reflect the desert, as you have in your tags. I'm thinking it's more along the line of mountains. Like a mountain with an over-wealth of partially menacing greenery, or perhaps a barren and brown mountain. I just don't really get a desert feel and the main reason for this, I think, is the dan tranh and it's composition. If that was replaced with a different instrument and composition, I could easily see it swaying by way of desert winds. (I am also reminded of the Metal Gear Solid series)
I enjoy that the length isn't overwhelming and can be listened to casually. This is a good marketing strategy, lol. It could always be longer, but I must keep in mind that this is a demo for a VST when it comes to length.
I have an issue with how some things are mixed, though. The strings and choirs are an excellent way of 'beefing up' your track as you say, but they get a little too fatty at some points and become burger-like, rather than a steak (in other words, they get too fuckin' loud, G). I'm not bashing your use of dynamics, it's that they overpower the dan tranh a little too much at some points.
I also wish you would cut some of those low mids on those loud drums. It bothered me a lot on the first listen through, but not so much now (7th listen or so).
To wrap it up, you have a good song on your hands with extremely minor mixing issues that are more than likely just opinionated criticism, but it doesn't 'wow' me enough.