00:01:688 - Maybe lowering the SV of this slider to x1.25? x1.5 is a bit too fast with the song being super unusual for beginners, so I think we should start something not too fast.
00:49:473 - Would add a note here as well since you follow the piano sounds for the latter doublets, and would be nicer to stay consistent to your rhythm as well.
01:12:830 - A bit nitpicky, but I think notes are better than slider here since you have done similarly to 01:11:116 after spinners, so your mapping is a bit inconsistent in this section now.
01:16:688 - I don't mind having the quad 1/3 since the BPM of this map is quite low, so you don't have to follow the guideline of RC for 1/3 patterns, but I would like to have a 2/1 gap here aka deleting this note to allow room for Futsuu players to react to the next pattern.