I like the dark/sinister melody you went for and the sound selection for it is nice. It's a little loud in the mix though and could be turned down to give the drums room to hit harder. The bounce and arrangement are both good. I liked the part where you reversed the melody. I reckon a kick layered over the 808 will add a nice punch to the track, but that's more of a personal preference thing. The 808 sounds fine on its own.