Must get to modding more again...
[General] - SB6.jpg should fade out. Speaking of the storyboard, actually, you should disable the background image and have it fade in and out when necessary, eliminating the need for black.jpg.
Directions are here. - I'd advise using more than two combo colours, adds a bit of variety. You could even have a different set of colours for each collab member, maybe.
- I'm worried the difficulty gap between [Normal] and [cRyo] might be a bit too much... not sure if it's worth making another difficulty or not.
[Collab] - Definitely use Tick Rate 2 here for consistency with the other difficulties.
00:51:999 (6,7) - Space the notes out a bit more here to prevent overlap. That's it, really. I checked the map twice to make sure.
[cRyo] - Your patterns tend to overlap in some places where it doesn't look good. For example,
(1) and (4) in this picture or
(1) and (3) in this picture. It might be good to try to avoid that in the future, you don't have to change all of them now or anything.
00:35:666 (1) - This note needs a new combo, it doesn't have one at the moment for some reason.
02:16:999 (1,2) - This overlap in particular doesn't look very good, (1) is covering too much of (2). Try to space things so (2) is completely visible.
[Normal]00:05:666 (3,1,2,3) - Try to avoid the slight overlap here, to make it look a bit better.
00:35:666 (1) - Note needs a new combo, like on cRyo's difficulty.
01:31:666 (1) - Missing new combo again.
02:43:499 (1,2) - These sliders don't look very good, the curve is too sharp. Try to make it a bit smoother, maybe?
Overall, things were pretty nice here and didn't require much fixing, so just Forum PM for a re-check after fixes.