Check out lcamtuf's latest 8-bit handheld game: Sir Box-a-lot.
It's Sokoban running on an AVR128DA with an RGB OLED screen.
https://lcamtuf.substack.com/p/mcu-land-part-7-life-in-full-color
He's also done some other "handheld" games in the past.
Incredible work.
@baldengineer This is very cool, thanks for sharing!