Nice. There's a couple of these (unfake which uses pixel snapping/palette reduction, sd-palettize which uses k-means to palette reduce, etc.) that I've used in the past in a Stable Diffusion -> Pixel Art pipeline.

I think it'd be worth calling out the differences.

[1] - https://github.com/jenissimo/unfake.js

[2] - https://github.com/Astropulse/sd-palettize