Hi first time modding so might not be of good quality but I'll try my best. Give or take it's up to you.
Generally the flow is good, comfortable to play, but the spacing is abit too small where it should be bigger like the chorus and its build up. Make the spacing for these sections bigger and the difficulty gap between hard and insane might increase as well.
Insane00:03:519 (3) - imo 1/2 slider then a circle would sound better according to the music
00:08:736 (1,2) - use 2 1/2 sliders instead, the piano sound fits better, i.e.
http://puu.sh/mlRG0/1b606637ac.jpg00:09:823 - , 00:10:040 - , 00:10:258 - map 3 circles here instead for the vocals (if you dont like to map to vocals its okay im just stating what's more intuitive for me, the "yuru" sounded very prominent)
00:11:345 (5) - put a circle here, move the reverse to 00:11:562 - then map a circle at 00:12:214 - for the 5 beats in front to be consistent with the behind one
00:13:519 (7,8) - 1/2 slider
00:20:249 (4,8) - 8 overlap with 4 for overall flow
00:24:379 (2) - 1/2 slider? the reverse can't seem to really fit in
00:44:818 (1,2,3,4) - maybe ctrl+h? awkward to play the same pattern back and forth again
00:48:490 (5) - can consider ctrl+h also, flows better imo
00:54:360 - from here onwards can consider increasing the spacing between notes, as build up for the chorus, if not abit too monotonous through the whole map
00:59:577 (5,6,7,8,9) - use 2 1/2 sliders (with maybe increasing sv)? as buildup for the chorus and the "bakari" is very prominent also
01:02:622 (1,2,3) - 1/2 slider instead? with lower sv
01:07:405 (3,4,5,6) - maybe a zigzag pattern going downwards? imo fits the song cuz "chirinuru" means falling down (okay bad reason) but the vocals pitch is decreasing too so something like this:
http://puu.sh/mlTGN/c20633eecd.jpg but your choice
01:11:209 (2) - remove this circle, consistent with the front section
01:22:617 (6) - move downwards abit, maybe in the middle of both sliders (sorry I like it symmetrical)
01:23:270 (1) - remove NC, use it here 01:23:487 (2)
01:33:486 (1) - ctrl+g maybe?
01:35:660 (2) - use 2 circles might be better, the song pattern is similar to the front few parts (if you're mapping to the background snares)
01:59:574 (4,5,6) - place some angle between the circles, one straight line abit awkward to play but ur choice
02:14:885 - if you want to be consistent at that section then add 1 circle here, make it either all 1/2 circles or triplets
02:18:580 (2) - remove this, sounds awkward, make the "chirinuru" a new section like 02:18:689 (3) - NC here
02:21:515 (2,3,4,5,6) - putting this here sounds abit weird, i suggest removing 02:21:624 (3) - and making 02:21:733 (4,5,6) - into 1/2 slider, fits the background cymbal sound better
02:31:299 (3,4,5) - im sure you can think of something better than straight lines, curve the slider abit more for better flow
02:49:972 (2) - maybe consider using a 3/4 slider since you're mapping to the guitar
02:50:190 (3) - remove this, no noticeable beat to map to
03:12:147 (3,4) - 1/2 slider again?
03:25:190 (5) - ctrl+g
overall not bad, very nice map, although you can consider making some of the sliders curve abit more for better flow at certain parts but otherwise the sliders are okay.
And for hard I'm not going to mod cuz I still don't have much experience, still learning, but I've looked through and I think you used way too many circles, try reducing the number of circles where possible and put in more sliders instead to reduce the difficulty. And try to use less streams/triplets if avoidable, but triplets are fine for hards. (your hard mcm copy paste from insane just change abit only so I assume still WIP)
good luck