Not bad, but I feel it lacks some kind of main-theme - there is no distinctive melody to hum along... but maybe that was intended. Anyway, such melodies make people cpme back to a song, so maybe you should think about it ;].
Yet, don't take this advice to seriously tough, for it comes from someone who has Beethovens' 5th and 9th Symphony, and classical music movie scores, along with Rammstein and a lot of J-Pop on his Winamp playlist xD.