Actually, I used 2 color palettes : The first inspired by Nokia 3210 phone (yeah, the one with the snake game... I got one twenty five years ago...) and the last by, yes you guessed it, Game Boy classic. I found them two on lospec.
This was one of the way to express the idea of begining with something very modest as a base for improvement. Starting small is what I'm doing as an "old" guy trying to learn making video games. And Bitsy is a pretty good tool for that.