Wow, that looks seriously cool.
Does your graphics style obey the restrictions of a real arcade/console/homecomputer antique, or is it "just" style? (looks great anyway!)
For the most part, yes.
For instance, I just made this sprite:
It uses 2 palettes.
The first is: white, pink, black, transparent
The second is: white, yellow, black, transparent
For the first frame, the pink and yellow palettes are limited to separate 8x8 tiles. But then when I animated it I ignored that limitation for better aesthetics
I made a lot of research back when I started this project for the NESJam