I liked that opening SFX -- but thought it clashed with the chord progression you wrote.
Piano chords seem really chunky in that low register. I recommend taking some of the notes and moving them up an octave.
Structure wise, this song is good. Progression wise, it's a little bit confusing, and the chords aren't resolving as well as they probably could be. I do like that it's not maximally loud, like most pieces are -- but as a dubstep piece, it probably could do with some compression.
Mix is a bit low-mid-heavy. Could probably use a tape saturator on some of your percussion to give it some edge.
As things go on, I'm starting to get used to your percussion, and your second drop comes together fairly nicely. I would recommend stretching it out with a repeat rather than a short bridge between drops. It's super short!
I will say atmospherically, this piece is fairly well done. I really don't like the floppy attacks and tons of reverb, especially on your brass, but ultimately, the mix is clear enough, and nothing sounds particularly bad despite some really mid-heavy sections.
I'd like to hear something other than a sine bass throughout.
What this track is lacking is punch and a strong bass line. Seems not to have a snare in the drop. Hi-hats are almost inaudible, and your drums are laying down in the mix. Tape saturator would fix a lot of that, but I would apply it carefully.
Bass is very smooth for dubstep. Possibly hearing some euro influences. If this is your genre of choice, I recommend looking at some tutorials on structuring your drops, versus your voices. I almost can't hear your growls relative to the intensity of those sub stabs, which are probably too loud.
Outro was a really nice touch. Probably one of the more tasteful I've heard.
Overall, track is pretty well-handled. With a little more oomph and a stronger intro, it could be a real banger. Nice work. :)