Not as difficult as I initially thought she was, she does have a lot of weirdly free patterns and most of the tricky stuff is near the start and easy to reset for. Particularly UNR, I am just hilariously bad at that for some reason. Maybe since I tend to overestimate the sun hitboxes which leaves me a lot less room to manoeuvre.
Peta Flare is also kinda hard but a lot more manageable, what really helps me is to focus on the blue bullets much more than the sun bullets. It can be quite mean sometimes though since it's just RNG spam, and the blue bullets are sometimes totally obscured by the suns which can be pretty garbage. Subsun is also troublesome for me, lots of things to pay attention to at once so I usually end up ramming into something that I didn't see. I've also had a DKO to this while on pace which sucked.
At present, Ripper Roo has 327 views spread across 13 videos for Subterranean Animism, and less than an hour worth of Subterranean Animism videos were uploaded to his channel. This is 1.66% of the total watchable video on Ripper Roo's YouTube channel.