00:34:299 (3) - 00:36:723 (3) - would replace these with 1/4 sliders to keep the gameplay more fluid. rhythm gaps like that can feel a bit awkward and choppy, especially when there is no real reason in the music for them
00:28:541 (1) - would add a circle here and start the spinner on the blue tick after to have the vocal clickable. should also end the spinner earlier so u can have a clickable object on the white tick.
00:17:632 (2,3) - would replace these with a 1/2 slider to get rid of the rhythm gap, since there is a held vocal going on during that gap
i actually prefer the slight change in rhythm here, cus the vocals have a different rhythm in the song as well and are more prominent than in the other parts. for example 00:08:919 - here there is no sound at all (besides the kick), but 01:58:634 (6) - here there is a very noticeable vocal
those are fine. the sliders are long enough (in the timeline) that the player has plenty of time to react to the lower sv and hold it accordingly