sp00ky styleeee.

The arrangement progresses nicely from idea to idea. Each melodic and rhythmic element fits together well, and you explore each possibility enough without dragging on and having the combination become stale. I think it works well with your stated goal of having a rap over it.

Production wise, I would consider pulling the level of the kick back jussssst a little bit, maybe 2-3db? I think it's sapping energy from the other elements of your track, and causing them to "hit" not quite as a hard. Everything sounds very cohesive, but there isn't much going on in the stereo field creating interest. Don't be afraid to hard-pan an element left or right. I could hear one of the later high melody reintroductions panned to one side and matched with a contrasting element on the other side of the stereo field.

Another thought, maybe a few unexpected elements throughout the track would ratchet up the interest level a bit. Maybe a quick synth arpeggio in the high register every 4 bars in a section, or a "one shot" sample here and there?