Building the level editor is always my favourite part! Being able to play a game and edit it at the same time has been my dream since childhood.
This time I budgeted extra time to make it more user friendly, which made level design a joy :)
Also, I was inspired by how concise the “WORLD” structure was your game harmony last year, and invested quite a bit of time getting the saved version of the levels to be as concise and human readable as possible, so they could be directly edited.