Pretty nice! I like the pace of the song. There are a couple of odd things though. Good thing they're relatively easy to fix. :p
First of all, there's one note in the melody that doesn't fit with the chords... it's in the final "section" of the melody. I think it's because you're using Eb natural minor, but there's one note that comes from Eb harmonic minor. The thing is though, that final section is a repeat of the second to last section, so it seems like it should work just fine. Well...
Different chords require different sets of notes sometimes. If you're just sticking with only the chords that any single scale gives you, then you don't need to switch scales in your melody. But if the chords do go outside of a given scale, then the melody needs to as well.
In this case, what's happening is that the first iteration of that repeated part in the melody is being played over a V chord, which is a borrowed chord from harmonic minor. The first time around, you do change chord scales to harmonic minor, but then you stay there when the chord switches back to I, and THAT's my humble hypothesis as to why that single note doesn't work quite so well... :p
Who knew there was so much to say about one note...
Anyways, the other problem I had noticed was a mix related one. I honestly don't know how much work you put into the mix because I don't have well trained ears for that particular task, but just in case you put a ton of effort into it, I'll be nice. :p
In dubstep, the kick and snare are huge driving forces for keeping the song going. I don't know if you know about SeamlessR, but he says that your drums in your premaster should be WAY too loud, specifically because they get beaten down pretty hard in the master. SeamlessR says that the drums should be at least 4x as loud as anything else, but that ends up sounding a bit too overpowering to my humble ears. :p
All I'm saying is that the kick and snare need to be louder in the premaster. By how much is a matter of taste.
Other than all that, I like the general feel and progression of the song.
Pretty cool. :D