Hitsounding requires polishment as for me.
First of all, I disagree with the current hitsounds you're using. For instance, 00:00:534 - drum whistle does not give enough feedback to the player because sound is too way prominent and whistle kind of blends and becomes inaudible unlike here 00:01:216 - , I'd recommend you to use something like
this or the normal sampleset if you don't want to use customs. And that goes consistently throughout the map.
Second of all, 00:00:534 - and 00:01:216 - have both whistles but sounds are different, 00:02:352 (2,3,4) - here as well. Goes consistently, too.
Third of all, 00:00:080 - / 00:01:898 - etc. - don't have a hitsound on but mind explaining why? They're sort of audible for being hitsounded, too. And this is the main concern so far, you're using like two hitsounds for the entire diff but the music is pretty full of few more snares and kicks.
tl;dr: it seems for me that there are - a lack of hitsounds itself, unfitting hitsounds and kind of inapprehensible hs placement.
and to be clear, combo colours ain't been placed intentionally?