Normal
A lot of sliders, I would concider changing out atleast a few of the them. I get what you're trying to do, but it's kinda overkill. The sliders feel very slow compared to the beat/circles too, try upping their speed.
00:27:792 (1) - Her voice starts earlier (where your spinner ends, move it up there)
00:55:065 (2) - Feels like starts out of nowhere compared to the rest of the sliders which follows either her voice or the melody, same for the same pattern right after it - 00:58:421 (2).
Z3RoXx's Hard
Quite the opposite problem as the normal mode, some split up sliders break the melody of the song, like 00:19:191 (1) or 00:36:184 (1), this fits better once the starts speeds up, but near the start, concider following the song more / slowing it down.
00:47:303 (4) - Break on wrong side, move 2/4 later to where the song starts instead.
01:12:687 (5) - Sonic slider out of nowhere - unfitting slider speed change.
Insane
00:01:359 (2) - Avoid circles this hard to read. People who is more than capable of hitting them will miss and get annoyed because it's just cheeky.
00:01:568 (3) - Also cheeky on top of a slider you thought you just finished. Also make it 2/4 shorter and add a note to fill in the gap, fits better.
00:11:429 (3) - Hard to read how many notes are in this jumping combo. Making the second 2 closer to each other than the first 2 could help identifying that there are in fact 4 notes.
00:14:995 (2) - Hard to read - space out more?
00:32:408 (1) - Sonic slider for no reason
01:05:135 (1) - Double 4 stack doesn't fit at all, hard to hit and nothing happens in song as you do it.
and then speeding it up again
01:12:058 (2) - Very fast sliders again here, not sure why.
nano
Very pretty start.
00:14:261 (1) - Felt weird, maybe slide it inwards the middle instead of out into nothing.
00:25:694 (1) - Stream doubling in over itself is almost impossible to read, even more so when you end it on the 3rd go 4 notes in which isn't even half of it. Either move the combo so it's longer and getrid of these 4 awkward last notes or don't stack. (Third option would be to have these 4 notes leading out of the stream making the player aware that this thing is ending)
00:27:582 (1) - Feels too fast compared to what the song is like, but it's fine, just keep it in mind.
00:30:729 (1) - Again, fast sliders out of nowhere, try to speed them up less or gradually instead of suddenly changing them like this, it will just make people who would/should hit them sliderbreak.
00:41:009 (1) - This whole part almost sounds like horses running - which would be nice if that was what the melody was like, but it's not, doesn't fit song.
00:45:624 (1) - Hard to read when another slider starts on top of it.
00:47:722 (1) - The horse pattern starts to fit better here. Keep it here.
01:07:652 (1) - Here this pattern fits. But after it, starting around 01:09:331 (1) it starts becoming less and less relevant to the song, concider changing.