engine for a very work in progress yume nikki fangame i'm working on

This looks INCREDIBLE, great job with the pixel art. The cat feature is top notch, and that hatch to the basement in the garden makes me fear that I'm not in Kansas anymore. But what palette is this? Is it a custom combination from the two existing ones?

here's a breakdown graphic - every area uses a frankenstein mix of the two, set with a raw memory write string. the fade in/out transition has a backup copy of the real palette, matched with a LUT at 0x5000 (workram before this stores compressed graphics for lillie)

A YN fangame on pico 8? Awesome! Looking forward to it

Truly impressive,thanks for the in-depth answer!