(very optional but something to consider) I think something to help with visual density would be to stack some of these circle -> slider patterns.
things like 01:22:393 (2,3) - and 01:25:965 (1,2) -
using it intentionally it could add more variation to the movement which I think would help in some of the longer chain patterns and make it easier to aim.
I think the last kiai needs some reworking in the rhythm department.
There's a lot of inconsistencies in terms of how you choose to express then some thing musically.
Another issue is just the density is a bit much.
01:30:965 (1,2,1,2,3,1,2,1,2,1,2,1) - and 01:36:858 (1,2,3,4,5,1,2,1,2,1,2,3,4) - are just way too much imo.
01:34:536 (2,1) - things like that can be really tricky to read due to both the density of the section and the inconsistency with previous sections.
01:37:036 (2) - this slider ending on such a prominent can also kinda throw off your sense of rhythm here since you're expecting something to be active here. 01:39:893 (1) - same here.
01:38:465 (1,2) - and 01:39:179 (1,2) - and quite different musically but are mapped in the same way end. 01:39:536 (2) - this could really just be a 1/2 slider and would break up the chain and give a short break.
01:32:750 (1,2,1,2) - probably don't need to follow the violins going ham on the normal haha, think some 1/2 sliders here would be nicer.
01:20:250 (1,2) - would work better rhythm wise if ctrl+g. 01:20:608 having this active would be more intuitive
01:19:000 (1) - should be 1/2 shorter imo so it lands on a more prominent note. Also so it creates a slight break since you just come out of a huge slider chain.
01:14:715 (2,3,4,5,6,7,8,9) - on the contrary this part reads fine since it's just the same rhythm. kinda not sure how I feel about 01:14:536 (1) - tho, something rhythm wise feels off next to the sliders that follow, not sure if you have anything else in mind for this.
01:08:108 (1) - doesn't work too well extended imo. Bringing it back 1/2 would cover the 1/4s perfectly, and going over feels like it ignores those drums.