We just released a minor update to the game that provides some extremely basic functionality for making your own puzzles and solving them in Sidewords. We noticed some people were starting to make their own puzzles, and we realized we could add some simple functionality for people who want it. But this feature is a bit undocumented/unsupported, at least for now. There are details on how to get it running in this thread in the discussion group: https://itch.io/t/259510/adding-your-own-puzzles

We'd love to see what kinds of puzzles you make!