Maybe making the OD to 6 instead. As it's a hard difficulty.
I think the first part can be a bit boring for quite a while, as you're repeating the same sliders. Try making a couple of variation with hitcircles and different slider placements. As for the hitsounds, I think you can make them quieter each time as the sound you're prioritizing seem to be fading away.
00:14:916 (1,2,3) - I think you can add more 3 sliders at the end as the sound still going.
00:26:050 - Perhaps a slider here as well?
00:40:784 - One here too?
01:02:012 - Three more here?
01:24:157 - ^
01:28:760 - to 02:18:606 - : As I said before this part can be quite boring with the repeating pattern, slider placemeenlacements and same spacing. Try to make it a variation of
01:43:529 (1) - Kinda flow unnaturally from the last circle to the slider. But, I don't know, since the slider velocity isn't that fast, it might be ok.
02:20:913 - You don't have to keep repeating the same placements all over again. I can see that you're trying to repeat certain part, but that doesn't mean that you should keep on going using the same thing over and over again. It can get quite boring.
02:27:375 (1) - Change NC to 02:27:836 (2) - insteaed, as the next circle has a greater sound and lands on a big white tick.
02:39:836 - There's a sound here. I think it's good to put one here as the music at this part seem to prioritizing 1/2 a lot.
02:45:144 - Changing to prioritizing the drum seems a little bit odd as you were going on the guitar. You also seem to keep changing between drum and guitar, so I think prioritizing one enough. I suggest you prioritize the drum before reaching the kiai time and at the kiai time, prioritize the guitar. I think this allow to make the kiai part stand out more than the rest.
03:15:836 (9) - NC
03:19:529 - The kiai time is a little bit anticlimactic though. Kiai is usually the part where the song feels intense. So when the last section has 1/2 things snapping and this only 1/1 is kinda weird.
03:50:913 - Perhaps a 3 beats slider here? There's a sound which kinda supports it.
05:54:606 (7) - NC, and try to make it symmetrical, so it seems balance on both side. And you can overlap the first and end slider so that it'll be like a perfect round of the heart.