Very interesting use of 5/4 and 4/4, and also how the sections in common time are split up. You mention the sections sound sporadic, I would agree due to how hectic the drum pattern is and no noticeable dynamic change between the sections. For boss music specifically I would say it's quite fitting stylistically though I would like something to keep the rhythm more grounded when changing time signature so often.
The melody is really catchy and quite discernable (I got a Gm Bbm Dm Dm7?) That with the descending and ascending patterns hidden behind the vibrato are a nice contrast and imo fits the theme really well.
The samples are nice touch and make it sound polished. The section with the crow sample, I would've preferred maybe a slow arpeggiation instead of block maj7 chords so it was more audible and ominous.