Udongein X (Version 1.0) - Easy 100% Speedrun 41:20
7Timer starts when selecting difficulty and stops when dealing the final hit to Yorihime.
(EDIT 05/01/2022 [I use DD/MM/YYYY, deal with it]: The finishing split isn't done this way for actual speedruns on speedrun.com. Again, this run was a proof of concept two days after the first version released.)
Easy difficulty is actually pretty tolerable in this game, having no instakill spikes is huge. Almost no undodgeable situations either, unlike what Normal and Lunatic like to do. With the movement options in the form of dashing and wall jumping, and the magic of the Fight or Flight upgrade (boosts your attack power and gives invincibility to your dash at low HP), this makes for a fun game to speedrun!
I'm speedrunning 100%, that is, all P items obtained. Upgrades are optional. The most useful upgrades are the aforementioned Fight or Flight, as well as the upgrades to charge speed and max HP. Fight or Flight does mean you'll have death hovering above you at any time, but the dash invincibility also provided by it can save you if you know how to abuse it.
Any% would probably get something like Fight or Flight only as well as probably one charge speed upgrade.
Looking back at it, starting with Tenshi's stage might be better than Yuugi, as the P item there is not even out of the way for getting Fight or Flight at the earliest (as such, it's better to hold onto the one item you get from the intro stage). Doremy's P item is also not "out of the way", but her stage is longer, and you get more mileage out of Fight or Flight on her boss fight than on Tenshi.
Quite a few mistakes in this run, especially on Yumemi, Tenshi and Reimu's stages, but this was meant to be a "proof of concept" speedrun.
My Discord server: https://discord.gg/Vgm9BeP