I like most of it, 1:51 feels like there is too much in the middle when you could have a more contrasting bass vs treble part, then you could slowly fill in haha.
Right after that i feel the koto is all by itself with too much bass. needs some support in the treble, a little bit more? When the flute comes in around the 3 min mark it is definitely good though
Starting at 4:22? When the koto/flute are basically both having the lead melody, I feel like that part could be longer and I want to hear the two harmonize rather than having some of the same notes!
other than that, intense and I like it.