I really dig it, this sort of stuff floats my capsule and personally I like the subtle evolution, if this type of stuff changes too abrubtly it can serve to lose the feel, from my own experience of listening to lots of this kind of stuff and having a go at doing similar types of pieces, I think there is a real art to resisting the temptation to make it go somewhere too fast, glacial changes are actually quite difficult to pull off IMHO, so good job in my book.
I made a comment on SC that it needs to be at least 3x longer, so 22minutes is even better 
I think this will be great for chilling to or meditation, and this area of music is very much coming into its own, I look foreward to hearing more!
