itch.io

Yes, all Pico-8 games are open-source.  There's also a specific channel you can post your games in for collaboration, so if you need inspiration or are just trying to get started it's a cool place to look.  Have fun!

Hey!  I hope all is going well for you.  I just wanted to point out that there's a Fantasy Console Game Jam just about to start.  I thought maybe you'd be interested in trying your hand at Pico-8, or some other similar platform!  I plan on giving it a shot again.  Maybe I can make something slightly better this time. :) https://itch.io/jam/fantasy-console-game-jam-2