Definately not bad, but gets repitive
Nice music, and nice melody. All in all a very nice piece, but the melody gets kindda boring after a while, almost to the point of becomming anoying. The part where you lower the volume is a nice touch, but it shouldn't be quite so dramatic, and keep the treble up a little more, because it sounds more like you are cupping your hands over the speakers than a nice effect.
But still, with a little more work, this piece could be really, really great. Maybe throw in another melody in there?