[General]
A suggestion: How about using Normal whistle on some of slider-slides? Just throwing a random example: 01:07:972 - (whistle's volume must be lower than 50% though) Using normal whistles would sound great imo. Now it sounds like something is missing with the hitsounds.
[Normal]
00:20:829 (3,5) - stack properly
01:45:114 (1) - This spinner* is a bit short for a Normal diff. Maybe you can end it here 01:47:019 - ?
02:35:591 - same whistle finish here
[Hard]
00:01:305 - whistle
00:03:210 - whistle
00:51:781 (1,4) - same normal slider-slide suggestions
01:55:591 (1,2,3) - looks kind of ugly
Couldn't find anything more, it's calm already. Good luck~