Very good orchestral aspect; dry, strange, and uncomfortable dubstep. For one, Dubstep songs have 2 or possibly 3 drops. Also, there's a lot of crackling going on from what I presume is the mastering. Speaking of which, I've been reading about mastering, let me tell you a bit about it.
The modern mastering chain is this: EQ, compressor(s), limiter. I personally put distortion either before or after the compressor. The idea with the distortion and compression is that you want to try to put the effects in a sensible order, which is usually something like least effect on the signal earlier in the chain to greatest effect on the signal later in the chain. For this song, here's what a mastering chain might look like, with just free plugins:
EQ (doesn't matter what EQ exactly, just make sure that the adjustments you make actually improve the sound by comparing the dry signal with the EQ'd signal)
Strong HP ~20-30 Hz (depending on key, because of sub, just make it as high as you can)
Gentle EQ to balance things (really shouldn't be more than 2 dB)
If you feel the need to EQ more than that, you probably ought to revise the mix
OTT at ~20% compression (I use the original OTT from Ableton because I use Ableton, the OTT VST might be different)
TDR Kotelnikov (fun to say but hard to type, is also an amazing free mastering compressor, get it here: https://www.tokyodawn.net/tdr-kotelnikov/ )
Faster attack ~= less "punch"
Faster release ~= more ugly pumping, unless that's what you want
Thresh and ratio depend on genre, but generally, 1-2 dB compression with 2:1 ratio is good
Kotelnikov has Peak and RMS release times, use the help ("?") button in the top right and hover over the controls to see what they mean
Also has stereo controls and "low frequency relax," they don't usually matter that much
Has good presets, just adjust the threshold
Some saturation of some kind with relatively low dry/wet (I use Ableton's native saturator, but anything will work really
SlickHDR (only x32, but still good; get it here: https://varietyofsound.wordpress.com/2014/01/30/released-slickhdr/ )
Confusing to use, but gets nice results
It can add volume back that Kotelnikov (or another mastering compressor you could have used) may have taken off
Can resurrect details
Just use this article: https://music.tutsplus.com/tutorials/how-to-use-slickhdr-from-variety-of-sound--audio-23290
Maybe a little bit of hard clip here with full dry/wet (be SUPREMELY careful with this, better for hard EDM)
LoudMax (get it here: https://loudmax.blogspot.com/ )
Never should compress more than 6 dB
...something like that. xD
Dubstep takes a lot of time, energy, focus, and lots of experience to get the hang of. This is pretty nice already, just keep pluggin' away.