General - I guess you are not using grid snapping at all? It might be better to use it if you want some symmetricity.
- How about making a 'Hard', for players like me? (At least I can survive in Insane with terrible accuracy, lol.)
Easy00:20:879 (1) ~ 00:25:879 (5) - Try spreading those things a bit? Those notes are placed on similar places with previous notes...
00:32:307 (1,2,3,4,5) - I guess we need more symmetricity here?
00:39:807 (X) - Add a note nere? Since it's kinda transition to another part, it's ok to emphasis here.
00:41:236 (2,3,1,2,3) - Add whistle in all of this notes would be better, since sounds in 2nd & 4th beats are similar.
02:00:164 (4) - I guess adding a note in 01:59:807 instead here would be better. Or just silencing it would be better.
Normal01:14:629 (X) ~ 01:14:807 (X) - Add something here?
01:59:450 (4) - Similar with 02:00:164 (4) in Easy, or just silencing the end of the slider?
52's Taiko - Lead-in is kinda short for Taiko.
- Try using kiai with a measure as a minimum unit. (=End kiai in 01:20:164, 01:35:879, 01:51:593)
00:16:593 (93,94,95,96) - Make same with 00:13:736 (77,78,79,80)? For firm composition of pattern, I mean. you can choose one of them. (or just leave them as current state since I think both are making sence.)
00:28:736 (173) - I guess starting new type of pattern from here would be better, for firm composition, as I said.
00:51:593 (325) - Try using different beat from here, like 'o-o-o--oo-ooo-o' instead of 'o-o-oo--ooo-o'.
01:08:736 (17) - It might be better to use some other patterns instead of kdd for those kiais, since you used this for different parts quite a lot already.
01:13:022 (46,47,48,49,50,51,52,53,54) - I recommend 'ddkdddkdk'.
01:28:736 (142,143,144,145,146,147,148,149,150) - 'kkdkddkkd'?
01:37:307 (196,200) - k?
01:59:451 (328,329,330,331) - a stream with 8 dons might be better.
Insane00:22:129 (4) - Felt a bit of strange here, 1/2-beat-long siders in 00:22:307 & 00:22:664 could be better.
00:26:593 (3,4,5) - Try something like this?
00:34:450 (1,2,3,4,5,6,7,8,9,10,1,2,3,4,5,6,7,8) - It is my personal preference, but I usually prefer to put one or two kind of patterns in something like here instead of trying varous things. You can also use jump to emphasize this part. (I mean, you used linear-form circles, overlapped circles, repeat slider, etc., but I prefer using simpler patterns with some jumps.)
00:37:307 (1) - Remove whistle from here? You can add something else instead, like finish. (I feel that it's a bit weird to hear the same hitsound with 00:40:343 (1,3,5,7) in here.)
01:09:093 (1,2,3,4,5) - I think this kind of rhythm doesn't really suite to music. Starting from 01:08:736, the music is like 'o===o-o-o===o-o-o===o-o-o==oo', but the pattern here is 'o---o===o---o===o'.
01:11:057 (4) - Move this to 01:11:147 would be better.
01:13:022 (1,2,3,4,5,6,7,8,9,10) - Try using 'smoother' arrangement for this kind of streams?
01:27:307 (1,2,3,4) - This looks weird with testing, try raising Stack Leniency a bit?
01:40:164 (1,2,3,4,5,6,7) - ^
01:43:022 (1,2,3,4,5,6) - Try using symmetricity here?
01:44:807 (2,3,1) - This doesn't looks so good to me, just 3 2-time-repeat slider like 01:44:450 (1) would be better.
01:51:236 (1,2,3,4,5) - Same with 01:27:307 (1,2,3,4).
01:53:736 (1,2,3) - ^
01:57:307 (1) - Similar with 02:00:164 (4) in Easy, or just silencing the end of the spinner?
The Taiko map could have been better...