(see here for details)
What is a Foddian game?
Think Getting Over It, Jump King, or Pogostuck. A Foddian game is generally unforgiving, has no real checkpoints, and has a constant threat of losing huge chunks of progress.
This doesn't mean you need to make a 2d platformer! You could, or you could take the Foddian spirit, and create something original and creative - incorporate rhythm, or exploration, or survival, or RPG mechanics, or whatever you can come up with!
Any questions about how the theme works can be asked in this thread. Playlist of Foddian games here.