hi it's the dude who told you to map this lolol
ty for mapping this, i now realize this song is a banger (ruby is my fav tho not kanan sadly)
instead of telling you everything to change, i'm going to list a few examples to give you ideas to improve. if it helps, pls hit the thumbs up on my posts. it increases my kudosu, and i spent a long time writing this. ty!
good luck on your mapping journey
when mapping, you should always try to represent the song as best as possible. this means listening to the vocals, melody/instrumental, and drums, and then deciding what to map from that. you can (and should) improvise, but your improvisation still has to fit with the feeling of the song.
to represent the feeling of this song, i think you should map almost all of the 1/4 doublet rhythms. 00:48:830 (210,211) is an example of one you mapped. i would also map these doublets to the instrumental/synth in the beginning (ex: 00:02:854, 00:04:805). this is really important because sometimes there's no notes on the loudest parts of the song.
one place where i think you SHOULDN'T map the 1/4 (drums) is 00:05:537 (27,28,29,30,31). this emphasizes the instrumental/synth and creates contrast with the doublet-heavy parts. i actually like this a lot.
another important tip is to keep consistency in mind: try to map similar things in similar ways
example: 03:05:293 (49,50,51,52) - you don't map the vocals even though you did other times
here's some rules about finishers you should follow 99% of the time
sliders can be used for held vocals/sounds, but i don't think it works for this song. the slider ticks are 246bpm so it also sounds too intense, and osu doesn't let you change it. based on the song, i think it's best to map to the instrumental here
here's how i would map it (time is 00:54:074): https://kivov.s-ul.eu/KgkszhlG
01:42:244 (1) - i would remove this spinner because of the instrumental silence. even if you're mapping to the vocals, the vocal at 01:42:610 is more important, and it's not represented.
i think a spinner might be ok in osu standard, but taiko spinners are loud and mashy xD
00:06:756 (32,33,34,35,36,37,38) - the coloring puts emphasis on the k's when there's no important sounds there. kddkdkd works better, for example.