Really interesting jazz harmonies, it got spicy at times, but it was executed with enough confidence to sell it. The soundtrack is pretty maximalist, you really don't shy away from using complex harmonies or using many instruments at once.
As far as the mix goes, the separation of the tonal parts is actually good, which speaks to a good arrangement considering the amount of different things you have going on. My main complaint would be that the drums get buried in the mix at times. For a mix this dense a spectral compressor like Trackspacer or MSpectralDynamics (there are other alternatives but I haven't been keeping up with them lately) would help a lot. You can use it to sidechain your kick, snare and toms to the tonal instrument bus so that it only cuts specific frequencies when when they hit.