Theme: Demons
Interpret that however you want, but some folks have suggested rolling a random demon from this list and making their game around it:

Use any engines or tools desired, with as little or as much effort as pleases you. Remember, the game doesn't need to be complete, it just needs to run. Art, music, and game design docs are also accepted. This is just for fun, no judgerino.

Links to help you get started with gamedev:
Engines
Unity - (Free, capable of 2D & 3D) https://store.unity.com/download
Unreal - (Free, capable of 2D & 3D) https://www.unrealengine.com/en-US/download
GB Studio - (Drag-and-drop to make 2D gameboy-esque games) https://www.gbstudio.dev/
Construct 3 - (Free trial, 2D) https://www.construct.net/en/make-games/buy-construct-3/personal-plans  
Stencyl - (Free, No coding required, 2D) http://www.stencyl.com/ 
Twine - (Free, Text-based adventure games with pictures) https://twinery.org/