Like I said in your thread, I like this piece a lot compositionally. It is very simple and minimalistic in it's mostly constant rhythm, but it is also filled with a lot of nice textures, especially in the middle section. I'm often drawn to music that has a dark and brooding feeling to it, and I also like me some good dissonance. That's what gives it that nice texture.
On to some minor issues with it. Pick clicking on Nylon strings is really audible and becomes kind of grating on the ears after a while, and it's pretty persistent through the whole song. It also sounds like there is some delay or something in some parts of the song that just may not be necessary. And because the tempo is somewhat free throughout the piece it sounded like it was muddying some parts up. I'd be willing to bet the parts where it's creating the echo and harmony towards the end could simply be played that way instead of using the delay to create it as an effect.
Now on to a proposal for you: If you could tab this piece out, or, even better, notate it, I'd like to learn it and re-record it for you (and for myself because I enjoy the piece). With a little bit of tweaking and some figuring out how to play the delays, I think it would sound really awesome. So if that's something you'd be interested in shoot me a PM and we'll make it happen!