bit_shifter
Re:Ask HN: 9-yo son wants to build a game, I'm lost. What can I do?
on Friday January 19, 2024 @11:15AM (#39057126)
Voxatron is what came to mind for me given OP's requirements. I own it but still haven't used it myself, but given it's from the same group as pico-8, I would bet it fits the bill perfectly.