I have known about the PICO-8 fantasy console for a while, due to finding a PICO-8 item in Celeste, but I learned this week that all the game tools you need to create games with it (including a music editor and a sprite editor) are built in. You can also view the code of any published game, so you can change it, edit it, and even publish it. It is so cool! I bought a license this week. I think my son will like to create games with it.