well
first off i love the piano it worked wonderfully there seems to be more trance then dubstep in here i was hoping to hear some more dubstep the dubstep at 1:54 2:34 i dont think it fit well with the rest of the piece it was one of those note arrangements that just sounded weird to me its like hitting b and b flat at the same time it just ruined it a bit for me for the rest of the song though i thought it was great i think you should make the build right before the dubstep parts should have been more dramatic and shouldve crescendoed some more there as well