I'm uhh...curious what kind of film this is for. It's pretty dry in terms of the production, which I think is a huge part of making rap instrumentals. If you're gonna start with something so bare in the beginning, a more heavily produced middle is a better contrast to that. Basically, the way you intro'd and outro'd was nice, but I don't think the meat of the piece justified its center. For me, reverb is a necessity, and I think that would help at the introduction of the synth pad and the tingly dingle arpeggiating at 00:36. Perhaps also pumping up the volume or velocity of the other synths during that section and fading that twangy bass pluck in the background so the melodic material can be heard better, especially once your main theme hits at 01:00. I also think adding some other ancillary instruments to thicken the sound would be great. Faint double basses are good behind any bass sound, and maybe a more legato or harsher sound for the main theme's synth since it's now just a short beep. Overall, I like your rhythmic choices with the drums and the filtering that adds atmosphere, especially at the end with the crinkle gargling static. Just needs...to be doubled with more sounds and balanced thereafter through effects like reverb or echo. Of course, I suppose it's okay not to go too crazy if there's gonna be a rapper overtop...

Seems like a lot of instruments are missing. I totally feel the vibe going with this one though. It would be a million times better if you added more melodies and raised the bass.