00:20:786 (1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4) - This part feels really underwhelming compared to the song's intensity, would recommend adding some hyperdashes
01:53:963 (1,2,1,2,1,2,1,2,1,2,1,2,1,2,1,2) - The 1/2 jumps here having inconsistent distances feel pretty awkward since while the song's intensity is rising the distances are rather decreasing. You can use 2.1~2.2 dash for some of 01:56:786 (1,2,1,2,1,2,1,2)
Some of the 1/4 hyperdashes like 02:50:080 (4) and 00:34:551 (1) are kinda overspaced compared to the song's intensity thus feel too much for the Rain. Would recommend going over the whole difficulty and reduce the 1/4 hyperdashes which are by far farther than the trigger distances.
worth considering ar9.1 or 9.2; the note spacing combined with the bpm on the low(er) side makes for some dense sections (for example, the streams between 00:57:492 (2) and 01:20:080 (1))