You sampled Requiem for a Dream?
I just find that odd...
Evidently, I think you could go crazy with the percussion of you chose to, if done right that could add to it. Its repetitive, I recommend using the louder chorus to help with that in some areas.
I'm kinda 50:50 on adding glitch music would be good for this. The intro is kinda long, I think you should shorten it a bit around the repeating chorus.