00:10:242 (5,6,7) - I think this rhythm is kinda unintuitive as the loudest sounds are on the slider ends. maybe ctrl+g the rhythm (Like: 00:15:451 (3,4,5,6,7) - )
00:42:218 (7,8) - this part is supposed to be essentially the same as 00:39:344 (7,8) - since the same thing repeats with minor differences, so to keep the rhythm consistent just use note - 1 beat slider as you did before.
00:46:709 (1) - maybe un-nc this for consistency? (I honestly have no idea why this is NCed in the first place xD)
00:56:050 (1) - un-nc this for 2 measure consistency (which you basically use throughout the whole diff)
00:57:397 - maybe mute the sliderend as there is no real sound on the blue tick.
01:01:080 (1,2) - this might be too difficult and unintuitive for a hard player to read, I recommend continuing with 01:00:362 (1,2) - these (https://osu.ppy.sh/ss/15879356/4230)
I wasn't sure what to do there, and saw another Hard diff' from a ranked mapset using this pattern at this specific part of the song. I've tried making it clear that 01:00:362 (1,2) - and 01:01:080 (1,2) - are not the same length by making a NC and making sure distance snapping is respected, so hopefully it should be enough. I'll see, though, maybe I'll change my mind and change it.
I think -Rik- is correct tho as 01:00:362 (1,2,1) - are grouped as a group of 3, people might think that 01:01:080 (1) - is a 4 tick 1/4 reverse as well, eventhough it's not.I wouldn't recommend grouping them as 2 x 2 as well as people might have the same idea ofthem being 1/4. I think making all 4 for them 4 tick reverses, un-ncing 01:01:080 (1) - and grouping them all in one line makes much more sense to me as the pattern automatically gets much mroe intuitive with consistency and spacing.
01:27:667 (1,2) - why are those suddenly stacked? you didn't use any stacks before. having a spacing between those would make good emphasis for those 2 vocals imo
01:31:259 (5,6) 01:36:289 (5,6,7,8) 01:42:756 (7,8) - it's much better to turn 1/2 into 1/1 instead just like what you did at 01:30:541 (3) and 01:42:038 (5) in order to emphasize that "siren" sound well.