this is good. it's too short though, you should add something in the intro part.
I liked it. ^-^
I know you stated in the description that you made something short and there really wasn't much room for many other things, but if there was a lot more going on in the song (in my opinion, percussion) and it was longer, of course, this could be great.
I don't really make or listen to dubstep so that's basically all I can offer as an opinion.