My first impression of this song was "this feels very conducted." You know starting out with a lot of short and intense notes, and then waving your hand to the right to bring in the slow wave of accompaniment. This song is very traditional, and it really doesn't dissappoint. It has very strong vibes to it, and I absolutely love how it sounds.
I would say this isn't the most "bossy" of the boss battles, but I can definitely see it fitting. Great job with the theme.
Can't wait to see more of your stuff, hoping for some more Orchestra stuff in the Winter! That's my favorite time for that kinda stuff.