I like the sounds you used in this song. It gives it a very dark sensation, which makes sense when it comes to Half Life and Combines.
I like the scream used mate, I think this is a good example of dubstep compared to some of the other uploads on NG.
Dubstep is a tricky genre, you really gotta get the LFO modulation just right, its almost an art in it's self.
Overall a nice track mate!
thanks man this song took me forever just to figure out the right patterns for the screamy melody thanks for reviewing :D