itch.io

I think it refers to crt-like shader effects where each color is split into its red, green and blue components:

https://en.wikipedia.org/wiki/File:CRT_Phosphors.jpg

https://en.wikipedia.org/wiki/File:CRT_screen._closeup.jpg

I created such a shader for the monkey-x-nes jam in 2015:

https://pixelpaladin.itch.io/epicfox

(by the way: since someone rated this game with only one star, no one plays it – so it would be nice if someone could rate it a little bit more objective)