Great song! I tend to listen to such music when I'm gaming and it makes for a great soundtrack when I need to tryhard, haha.
Mixing and mastering is excellent here. No clipping, clean high frequencies and much power at the lower end.
My critical point would be: What exactly has this track to do with Halloween? Most songs of the hard dubstep/psytrance genre do sound rather dark and mostly are played in minor. These are characteristics of the genres and don't make them Halloween-themed immediately, in my opinion.
I can't tell there is anything where I would say "Oh yeah, this is a Halloween track!"