Those are some really nice ideas. We definitely wanted to add some element of pressure that would force the player to think / act quickly to avoid exploiting the editor mode too much. I like the idea of a lifespan to the platforms placed, maybe make them glitch out to make it coherent with the theme. Our idea was to have some incoming danger like the blue screen that appears in one of the rooms, but generalized to the rest (forcing the player to escape and thus not taking too much time placing 100s of platforms).
Thanks for the ideas and the feedback!