No, I didn't created a Discord specifically for this jam as it was created really out of nowhere :D
I'm though active on Defold forum, where the idea for this started: https://forum.defold.com/t/defall-game-idea-generator/76468/7?u=pawel
And here is my Discord (mainly for games I'm working on, but nevertheless, I invite you! :D): https://discord.gg/MBzh7aEfpy