Hmm.
Man there's just SO much here. My first concern is get some real equipment or software. Maybe I just don't like this particular tone. I dunno what kind of set up your using so I don't want to just assume it's shoddy, but I hope you see my point.
To be honest I have very little patience for long single-instrument compositions. I kept going back and forth between bored and "I need to rewind and hear that again." Around 6 minutes in, those 6 or 7 seconds are my favorite. I know it's odd to pin point a 5 second clip of a 7 minute composition but everything was spot on there. The melody, the dynamics, the progression. There are moments like that throughout the piece, but for the most part its pretty much (above) average. Another good moment is from 7minutes to about 7:20 as it's winding down.
I'd really like to see you try some shorter pieces and create something that strikes me as a song, in the way that these "moments" did.
Bit of a long winded review, if you want to talk more feel free to send me a message, about music, composition or whatever.