copper crystal
smots gaming
-# Those who know...
Double jump map centered around sideways springs (and exactly one upright spring)
For real though, it's just a [poo] post adaptation of the 8th room of the checkpoint "Scattered Mirror of the Storm" in Final Goodbye as part of Monika's D-sides from Celeste. Why this room in particular? It's an inside joke, if you know you know. It's been remade in many other platformers (sometimes not even a platformer), so why not here now too?
Edit: A map recreating this has already been made, however when I looked for it in game I couldn't find it so if anyone knows the code that'd be nice.
merry jolt
wintry yarrow
shell thorn