[General]
Sawa's Hard has a different preview time. I suggest to set it at 46491, like the other diffs.
Artist shouldn't be capitalized in that case. Change "Heidi." into "heidi."
I suggest to change the Title in "∞ Loop (TV Size)" and to leave Romanized title "Loop (TV Size)"
I thing you should change kuronumasawako into KuronumaSawako in tags.
[Easy]
00:07:675 (1,2,3) - Change the Combo Color to another one
00:11:204 (1,2) - Combo Color 3
00:12:968 (3) - New combo + Combo Color 2
00:16:497 (3,4) - New combo + Combo Color 4
01:14:722 (1) - Combo Color 3
01:16:486 (2,3) - New combo + Combo Color 1
01:18:250 (1) - Combo Color 4
01:20:015 (2,3) - New combo + Combo Color 3 or 1
01:21:779 (1,2,3,4) - Combo Color 2
[Normal]
00:07:675 (1,2,3) - Change the Combo Color to another one
00:11:204 (1,2) - Combo Color 3
00:12:968 (3,4,5) - New combo + Combo Color 2
00:16:497 (3,4,5) - New combo + Combo Color 4
00:34:135 (3) - New Combo?
01:14:722 (1,2) - Combo Color 3
01:16:486 (3,4,5) - New combo + Combo Color 1
01:18:250 (1,2,3) - Combo Color 4
01:20:456 (4,5,6) - New combo + Combo Color 3 or 1
01:21:779 (1,2,3,4) - Combo Color 2
[Sawa's Hard]
00:07:674 (1,2,3,4,5,6,7,8,9) - Change the Combo Color to another one, then:
00:11:203 (10) - New combo + Combo Color 3
00:11:423 (1) - Remove New Combo
[Insane]
00:11:204 (1,2,3,4,5,6,7,8,9,10) - Combo Color 3
00:12:968 (1,2,3,4,5) - Combo Color 2
00:14:733 (1,2,3,4) - Combo Color 1
00:16:497 (1,2,3,4,5,6,7,8,9) - Combo Color 4
01:12:516 (1,2,3,4,5) - Change the Combo Color to another one
01:14:722 (1,2,3,4,5,6,7) - Combo Color 3
01:18:250 (1,2,3,4) - Combo Color 4
01:21:779 (1,2,3,4,5,6,7,8) - Combo Color 2