I like the little ambient riser thing at the very beginning. I think the bass overpowers the kick and snare for the next 30 seconds or so. Generally, the snare should be the loudest instrument in the mix. I liked the transitions at :31 and :58, and the panning effects worked well there too. Harmonically, the piece is very simple and repetitive. I think you need a lot more melodic content here. The very little non-rhythmic content you have in here (at 1:56) is very stepwise and one-directional. The result is that the piece lacks direction. The piece changes and evolves over time, but it has little sense of coherence overall because you never return to and flesh out the themes you introduced earlier in the piece (like at :02). Otherwise, the structure doesn't have much meaning behind it. Overall, it's not bad. The lack of melodic content and structuring are my main complaints. Keep at it, man. ;)