Nice use of rhythm in this piece, but you're WAY overusing solid non-volume dynamic buzz-tones. Slow fades on those tones would have seriously enhanced the piece overall. However, you're doing some wonderfully melodic things as the piece progresses. Now that I think of it, perhaps a mere constant left-right fade in those buzz-tones would be the perfect treatment for the piece. Give it that circular feeling, you know?
*runs off to go play with his microphones and his drums and hides from all things techno*