Wth is with HP Drain and Approaching Rate? Move them to left, they should not be so high. You can make your notes go faster by adding velocity points in the timing section. You already know it but still.

Diff needs variety of notes and fixing of consistency.

00:03:852 (3) - make this k, probably will sound better.
00:06:929 (7) - d to the same reason.
00:13:852 (16) - k, higher pitch.
00:16:929 (22) - k for the variety.
00:20:006 (28) - ^.
00:32:698 - add a note here.
00:34:621 (49) - k, higher pitch.
00:36:929 (52) - k for the variety.
00:37:314 - add d here.
00:40:390 - ^.
00:40:775 (57) - make this k.
00:42:698 - add d here.
00:45:006 - add k here.
00:45:390 (63) - d finisher instead of k here.
00:46:160 (64) - k here.
00:46:544 - add d here.
00:46:929 (65) - make this d.
00:49:621 - you can add k here or leave a break.
00:50:006 (69) - move this to 00:49:814 acc to music.
00:57:314 (82,83,84,85,86,87,88,89,90,91) - this part is not consistent with all you mapped before, look through and fix some things.
01:06:544 - add k here and make 01:06:929 (96) - k too acc to music.
01:10:006 (100) - make this one d finisher instead.
01:11:929 - add k here.
01:13:083 (104) - k! Drum sound here.
01:13:467 - ^.
01:15:006 - ^.
01:18:083 (111) - move this to 01:18:275 - probably sounds better.
01:24:237 - add a note here (which is up to you, i would be ok with both d and k so doesn't matter).
01:26:544 - add k here? Too many 1/1 sections are boring.
01:31:544 (130) - make d finisher instead of k.
01:37:314 - add k here.
01:46:544 (153,154) - Ctrl+G.
01:49:621 (159) - suddenly you decided to put many 1/2 at a time, give kantan players a break, remove this.
01:53:083 (166) - probably d.
01:55:775 (171) - remove acc to the reason above.
02:01:544 (182) - why k? No high pitch or smth, d.
02:01:929 (183) - move this to 02:02:121 and make it k.
02:02:314 (184) - unnecessary one, del.
02:08:852 - add d here.
02:15:006 - k here.
02:21:160 - ^.
02:27:314 - ^.
02:46:160 - add d here.
02:55:006 - add k here.
02:56:544 - ^ because you had very similar part and it was good, so let it continue.
02:59:621 - ^.
03:03:467 - move this to 03:03:660 and make it k.
03:03:852 - move to 03:04:044.
03:04:621 (278) - move to 03:04:237.
03:06:160 (281) - move to 03:05:967 for consistency.

Pretty much an issue on all of the diffs but kantan is not bugged with this. Move your velocity timing point here 01:10:006 (on other diffs too please, i will probably forget to write it to other three) to the next tick because this strange switching of speed can be confusing even for average oni players sometimes and this one is futsuu after all.
And Approach Rate again, reduce it.

00:05:006 (9) - drum sound here so k.
00:29:044 (76,77,78,79,80) - not consistent to what you mapped before it, i guess just move that two ticks forward, that sounds good.
00:35:775 (92) - add 1/4 d and k after this.
00:32:506 (86,87,88,89,90,91,92) - same is higher; suggest you to move 00:32:506 (86) to 00:32:698; add k here 00:34:237 and here 00:35:775.
00:40:967 (106,107) - put here smth like this instead.
00:41:929 - put k here and switch 00:42:121 (110) to d.
00:43:467 (114) - k, drum sound.
00:45:006 - k here?
00:45:775 - ^.
00:46:544 - ^.
00:47:314 - ^.
00:47:506 (125) - put this here 00:47:698.
00:47:890 (127) - this to 00:48:083.
00:50:198 - add d here.
00:51:544 (137) - k, high pitch.
00:56:737, 00:57:121 - add d to both.
00:57:314 - add k here.
00:59:044 - add a note here.
01:00:967 - think of a spinner here to 01:01:737.
01:08:660, 01:09:044, 01:09:237 - add d to all.
01:09:429 (173) - move this to 01:09:621.
01:21:929 - add d here?
01:25:006 - ^.
01:31:352 - ^.
01:33:275 - k here.
01:39:621 - d here.
01:41:544 (273,276,277,278) - add finishers to these?
01:44:814 (283,286) - try k on these.
01:50:390 (301) - remove finisher here.
01:51:544 (305) - d.
01:53:083 (310) - ^.
01:54:237 (314) - k.
01:55:583 (318,319) - Ctrl+G.
02:08:852 - add d here.
02:09:621 - ^?
02:16:544 (386) - try k finisher here.
02:18:852 - add k here.
02:21:160 - ^.
02:22:698 (406) - k.
02:23:467 - add d here.
02:23:660 (409) - switch to d.
02:24:237 - add d here.
02:24:429 (411) - k.
02:27:698 (422) - d.
02:30:390 - add k.
02:31:352 - ^.
02:32:698 (437) - k.
02:34:237 - add k.
02:34:429 (443,444) - Ctrl+G.
02:35:006 (445) - k.
02:35:775 (447,448) - Ctrl+G.
02:36:544 (450) - k.
02:37:506 - add k.
02:37:698 (454) - d.
02:40:390 - add k.
02:41:929 (468,469) - Ctrl+G.
02:42:698 - add d.
02:50:775 (496,499,500,501) - make finishers.
02:54:429 (506,507) - Ctrl+G.
02:59:814 (522) - this to 02:59:621.
03:01:352 (527) - here 03:01:160.

Approach rate again, reduce.

00:04:814 (9,10) - ctrl+g.
00:23:083 (80) - d.
00:26:929 (92) - finisher?
00:27:314 (93,95) - ctrl+g.
00:29:621 - add a note here.
00:31:737 - ^.
00:32:698 - ^.
00:33:467 (115,116) - ctrl+g.
00:34:237 - add k.
00:35:775 - ^.
00:35:967 (123,124) - ctrl+g.
00:39:429 (137,138) - ^.
00:56:352 - add d.
00:56:833 - two ^.
00:57:314 (196) - k.
01:00:390 (207,208) - ctrl+g.
01:01:352 - same as 00:56:833.
01:03:467 (215,216) - ctrl+g.
01:06:160 (221) - k.
01:08:275 (227) - ^.
01:09:044 (228) - move to 01:09:237.
01:41:544 (370,373,374,375,376) - finishers; 01:42:890 (375) - k.
01:43:403 (377,378) - 1/6? There is no 1/6, it's regular 1/4 so 01:43:403 (377) must be here 01:43:371 (377).
02:09:525 - add k for triplet?
02:16:544 (515) - k.
02:16:737 (516,517) - ctrl+g.
02:22:506 (540,541) - ^.
02:32:506 (589,590) - ^.
02:33:275 (592) - d.
02:33:564 (594) - remove.
02:34:621 (599,600) - ctrl+g.
02:36:448 (608) - remove.
02:36:544 (609) - k.
02:41:544 (633) - d.
02:42:506 (637,638) - ctrl+g.
02:44:044 (645,646) - ^.
02:45:871 (654) - remove.
02:54:429 (693,694) - ddd instead.
02:57:602 - add k here.
02:58:948 (714) - remove.
02:59:237 - add d.
02:59:621 (717,718) - ctrl+g.
03:06:544 (1) - better put finish and move your spinner to one tick -one tick at the end.

Probably add more triplets to this diff. And make one note breaks between all those bunches of notes.

00:12:794 (49) - remove.
00:13:371 (52) - ^.
00:15:583 (65) - oni players wanna have a break too, remove this 00:15:583 (65).
00:15:775 (66,67) - ctrl+g.
00:26:480 (117,118) - 1/4 here like in muzu.
00:39:044 - add a note here.
00:39:621 (175) - here's drum sound, k.
00:41:737 (184,185,186) - full alternate this, k to d and d to k.
01:01:352 - add two 1/4 d here.
01:16:160 (317,318,319,320,321,322,323,324,325,326,327,328) - not consistent section, change patterns.
01:18:083 (331,332) - k finishers will be better.
01:21:929 (352) - k.
01:33:467 (418) - ^.
01:43:403 (472,473) - 1/4 again.
02:05:390 (600,601,602,603,604,605) - change patterns here; try ddd and kdk instead of those you made.
02:21:352 (697) - k.
02:21:833 (700,701) - ctrl+g.
02:31:737 (760,761,762,763) - ^.
02:33:564 (771,772) - ^.
02:34:621 (777) - d.
02:34:910 (779,780) - ctrl+g.
02:40:775 (814) - finisher?
02:43:275 (829,830,831,833,834,835,839,840,841,845,846,847,853,854,855,866,867,868) - these are the same! Use different patterns please.
02:52:634 (882,883) - 1/4.
02:58:660 (915,916,917,918) - ctrl+g.
03:04:942 (943,944) - 1/4.
03:06:544 (1) - same as in muzu.

I leave all the suggestions from oni with some new here.

01:21:737 (397,398,399,400,401) - try dkkkd instead.
01:26:352 (431,432,433,434,435) - try kkddk.
01:37:217 (511,512) - ctrl+g.
02:02:025 (683,684,685) - kkk.
02:27:506 (866,867,868,869,870,871,872,873,874,875,876,877,878,879,880,881,882,883,884,885,886,887);
02:31:544 (901,902,903,904,905,906,907,908,909,910,911,912,913);
02:40:775 (972,973,974,975,976,977,978,979,980,981,982,983,984);
02:43:852 (997,998,999,1000,1001,1002,1003,1004,1005,1006,1007,1008,1009) - don't know about these streams. Try to reduce their lenghth because they're making your diff overmapped alot.
03:05:198 - add d here.