Some parts of the timeline don't fit at all with the melody. I've tried to make it a bit more interesting to players, so you may consider applying that specific changes.
[Kurai's CTB Rain]
AR9 CS5 here? No way... AR/CS8 and CS4 fit MUCH better to those patterns.
00:05:628 (1,2) - Honestly, if you place both notes like
THIS, they'd fit better to the music.
00:08:464 (5) - It can be a bit nazi, but it looks better if you move it 1 grid left imo.
00:11:142 (4,5,x,x,1) - You can add 2 more notes before (1), creating a 1/4 triplet. To organize better that part, I've rearranged a bit all those notes, as it's shown
HERE, you can try it if you like it (HDash between 7-1).
00:14:178 (5) - I didn't really expect a slider here. Remove it, and place a note in 00:14:178 (5) - x:136, and another one in 00:14:535 (6) - x:376.
00:15:428 (4,1) - From 00:15:428 to 00:15:963, it's better to add a whole 1/4 stream... The current timeline doesn't fit at all with the melody.
00:33:119 (1,2,3,4,5) - Try this pattern to follow better the lyrics
HERE.
00:34:548 (1) - Ctrl-R, so it fits the previous pattern.
00:38:655 (11) - 2 grids to the right, to make it more confortable at gameplay.
00:39:013 (2) - 2 grids to the left. It's easier to catch, cos the curve is not as sharp.
00:39:732 (7,8,9,1) - It feels better to play if you make those notes more spreaded. You can move (9) 2 grids to the left, and (1) 2 to the right.
00:44:368 (7,1,2,3,4,1) - Time to rearrange this part too, removing the slider with some notes, and touching a bit the NCs. You can check it
HERE, and
HERE.
01:01:853 (1,2,3,4,5,6,7,8,9,1) - Again, placed some notes in a different way in the timeline, and changed the structure of them,
HERE.
01:08:839 (1) - The singer is almost shouting here, and this jump isn't as wide as expected orz. You can try placing it at x:472, for example.
01:11:160 (4,5,6,1,2) - Same here. Look at
THIS, as I've changed some notes here to get a nice jump.
01:13:303 (8) - NC, it's too long imo.
01:17:410 (1) - It's better a 1/2 triplet here, or a 1/2 slider with 1 repetition.
01:23:124 (1,2,3,4,5,6,7,8) - Looks a bit ugly. Let's try moving (3) and (7) 4 to the right, and (2) 2 to the left. (8) in x:424 to create a proper HDash.
That's all the major problems I could find. I can try asking another player to get this map a bit more polished.
And Kurai, don't be so afraid of adding HDashes... A CTB Rain w/o them is like a Taiko Oni w/o kats lol.