01:56:395 (2) - 01:57:835 (1) - 02:00:715 (1) - these shouldn't be sliders since there are really strong and noticeable drum sounds on the slider ends. Making parts like this 01:59:755 (1,2) - into 1/2 sliders would work better since there isn't a really noticeable drum sound on 2. For example 01:55:915 (1) - this is good.
I think you should decrease it a bit more. Most people can't notice 0.1 difference in slider velocity. Around 0.8 or 0.7 should do the trick in my opinion.
I call these sliders full beat sliders (I'm not sure what other people call them). I think it's not the best choice here. The "singer" sings more intensively here 00:10:613 than on the next note (00:10:749 (1) - ). In my opinion this slider should be a 3/4 slider with a note here 00:10:613
I the slider first and then the circle. What I tried to say is "make the object here 00:19:204 (3) into a 1/2 slider and place a circle on the next white tick" .
I don't think it's really a problem if it's a little bit difficult (but that's my opinion). If the song has a dense rhythm then it the normal diff usually has a higher star rating.
In my opinion you should map 00:46:476 (6) - as a 1/2 repeating slider and put a note on the next red tick 00:50:431 . It just feels awkward to randomly start skipping singer notes after playing all of them for a bit. https://imgur.com/a/7tsUQhX
It's fine then. If you want to address the issue you can also just use the default sound effects. Most people probably don't use custom sound effects anyways so that should be fine.