Kamiki Boulder Skip

Explanation

With Kamiki Boulder Skip you can leave Kamiki Village early allowing you to skip it entirely in NG+ any% and having to come back only once during NG+ AB. It is performed by doing a wall jump to the left of the boulder and then doing a KT arcing around an invisible that extends higher than the boulder hitbox. It is possible to get stuck inside the boulder, but with successive KTs you can still leave.

Demonstration: https://youtu.be/IA6FxpIdxRM?t=287

Reverse Boulder Skip

In All Brushes you have to return to Kamiki after getting Bloom to get Lily Pad and Sunrise. However the boulder is still there so you have to do a harder almost Blind KT to clip through the boulder and get on top of it. By going to the right side and holding backwards on the wall jump the camera will stick with you better to prevent the blind KT from happening.

Demonstration: https://youtu.be/IA6FxpIdxRM?t=672

Side effects

Because you skip fixing the village it gets stuck in a halfstate. There's still a few whisps of mist and some of the villagers are still petrified. This while the village looks restored and you can bloom trees just fine.

You can also do the digging game without Mushi's Mum chasing you down since she's still petrified. You can also present the Odd-shaped Turnip to Mushi without any problems. Mushi will still move his head as if he's normal even though he's still petrified.

Demonstration: https://youtu.be/nfCAEMh-hjs?t=718