I've created a webpage for hosting user-made worlds. You can find more puzzles to play here: https://ludobloom.com/leafsodyssey_worlds.html

If you've made a world of your own and want to submit it for listing, there's an upload form linked from that page. I'm hoping to eventually integrate this directly into the game so that you won't have to do the extra import/export step and can simply see the listing and choose one to play, but for now this at least collects all of the existing custom worlds in one place.

Have fun!