Perhaps make the OD and HP + 1 or at least + 0.5 because 3/3 is a bit too low for a Kantan especially considering the HP Drain is extremely lenient.
OK00:04:770 (1,2) - Maybe invert these? it seems nicer to me to have d k D as a buildup
k d seems better imo00:14:715 (20) - I was thinking maybe it would give more impact if this was replaced with, say, a few notes, because it brings out the instruments a bit more imo
e.g. this OK00:22:008 (32,33) - Invert these? It gives more emphasis to the vocal because of pitch relevancy imo.
OK01:02:118 (87) - I recommend replacing this with a spinner because it gives more buildup and also streaming at 181 BPM for a Kantan for this long is kinda weird.
OK01:10:406 (99,100,101) - this pattern would really sound nicer as ddk or dkk because it seems to support the small vocal and instrumental buildup happening now, preferably ddk because it gives more emphasis to the k
OK01:14:384 (107,108,109) - This pattern would sound nicer as kkd instead; gives more emphasis to the d this time, because the vocal keeps going lower
OK01:21:013 (120,121,122) - Refer to 01:10:406
OK