For a first-time entry in Dubstep, this isn't bad. The mixing is pretty good, given the genre. The noises you made are obnoxious (in a good way) but not overpowering, and I can hear everything going on. The only thing I'd recommend is making the song more melodic. The reason I say that is, although the noises can be fun to listen to, I find them easier to forget by their nature of being noises. The melodic synth leads are what I gravitate to most. They are something in the song to grab onto; they get stuck in my head and bring me back for more.
If you decide to do more Dubstep, I hope you take my feedback as constructive and helpful. :)