Hey there!
[General]
I think you should put your storyboard in .osu files and exclude it from your taiko diff, because the SB is disrupting the playfield and with no way of toggling it off (like novideo for example), I am not sure it's a good idea. There is no clear rule stating that there must not be such a SB in a taiko diff, so this is not unrankable, but I think it would be a nice change, even though taiko players would be unable to see the SB (which is rather cute and awesome btw). Up to you I guess.
[Insane]
00:05:740 (1,2,3) - I see you used distance snap for the whole map, but please, break away just for these atleast. It feels much better if you used jumps for these. Something like
this perhaps?
01:00:140 (1,2,3) - Similarly to the above, it plays weird with distance snap. Also, maybe just use a circle instead of a short slider? In any case, I would love to see jumps here.
01:14:540 (10) - A slider speed change like this is unrankable (now), because there is no clear visual indication that it would be a slowed one. A nice gimmick would be to put a new combo here and have a single combo for this slider, other gimmick would be setting tickrate 2, but I am not sure if that would work because of the slider length. I recommend a simple new combo for this slider. Like this. (observation: You didn't slow this slider: 01:24:540 (3), and it's essentially the same thing, maybe just make a curved slider like this instead?)01:21:340 (4,5,6,7) - Could be just me, but I despise patterns like this, they play bad and they stop the flow. How about unstacking the small stream from the single note? Feels much better to me. Up to you though.
[Hard]
AR+1 please, AR6 feels really slow orz.
[Normal]
01:00:140 (1) - If possible, would be nice that this slider points to some other direction. Currently, all your double repeaters are pointing towards the next note, but this one is not a double repeater and is positioned in the same manner, which could cause confusion maybe. Just making the slider so it goes down and back up will completely eliminate this problem.
01:28:940 - Consider adding a note here? You ended your map before the song ended, and you mapped this part in your higher diffs. A simple change to the timeline fixes this problem, like
this.
[Easy]
01:28:940 - Just like in normal, I don't like how you didn't map the very end. Try
this? Sounds nice and lets you play the song to the very end!
Just minor changes that should probably be done, after that I can rank this!
Awesome storyboard btw!