Mmmmm Dubstep...
Okay, in terms of composition... As far as I know, get rid of the sub in some parts... such as during the buildup, a build up does not need the sub if there's a rolling kick drum, it will make just a mess in the lower end and when you reach the climax, it's not going to sound very impactful. Also I say you need alot more FX like risers and crashes and things like that..
Kick needs major sidechain compression on the sub, it's like becoming one with the sub bass almost every time it hits
I'm not liking the sound design... I know its experimental but it's kinda cringe worthy a bit... ;w;
If you want to keep the sound design, maybe you could do some extreme sidechaining to make the whole track pump
It's kinda like how Seven Lions would do it. Every time the Kick or snare hits, everything kinda drops in volume and the rises back up on the off beat. It makes the track just pump, ya know? I think it would really make this track sound cool
Anyway that's about all I can say, keep up the good work tho~ : >