I'll see about making a guide!

The dark Nursery in my and your videos are both a little faster than ZoeVermillion's, I believe, especially if you include the time loss of switching rings (~2s each time).

I don't plan to run this game, alas, as I barely have time for my existing speedgames ): Plus, the emulator (VBA) I like to use use isn't accurate and has graphical issues with some of the minigames and slows down during the non-dark Nursery, but VBA-M hates my controller and I dislike it overall. VBA-M emulates this game well, though.

I mapped the entirety of this game after seeing ZoeVermilion run it at Frost Fatales, and then thought I'd had a go at routing Dragon Nursery without using Fiera's Ring, because who doesn't love bonking in a speedrun?

Maps of the route in and out: https://imgur.com/a/RZjoOu1 Video: In the video, I made a few mistakes, but it's still faster than doing it with the ring!

It turned out very similar to the route Oxknifer takes in their video. Some of the segments can optimized by relying on timing/muscle memory a little more, but I think this is a good and relatively safe starting point, and already saves a little bit of time even in its current state.

Unfortunately, you still have to play the matching game to obtain Fiera's Ring just to be able to activate the lamp, there's no routing that out. Doing the nursery in the dark is therefore only a minor time save, and the riskiness means it might not be worth going for. Looks hella neat though!

(Also, my (labelled) maps of this game are on VGMaps, perhaps they'll be of use to anyone who wants to route 100%!)

Not an opinion, but an additional thing I'd like to mention: There was a discussion on Discord a while back about how even in ideal circumstances, Roll Jumping on separate buttons can be inconsistent depending on your hardware (and maybe software?). For some people, the inputs would come in on consecutive frames sometimes, both on controller and keyboard, while others would get RJ consistently even without practice (again, in ideal conditions, not when juggling RJing with other gameplay - that still requires practice).