Making the test level return to the editor was actually really painless to implement. Some other stuff did go on, too:
- Level in testing can return to the editor on completion or return button.
- Importing level code to the editor is much more robust, throws an error if you try to be clever/stupid.
- Drew a door block, and made it end the test level or go to next level. (Which does work, there was a typo in my code to make it glitch in this vid, yaaay 8D)