It would be fun if there were secret levels. So to speak, NPCs who are, say, soldiers and they shoot from something :).
can't you make secret levels with custom doors?
but yeah, red/blue (or maybe green/yellow or something) switches could be made to persist whole game - like coins...
In terms of? I'm not the creator.
i know but for the now you can make few exits and entrances to one room so its theoretically possible to mess up specially as recently it got an option to hide level-changing animation...