There's nothing "adult" about this room, either in the script itself or in the theme/tone. That said, the puzzles will be difficult, and we ask that any players under 16 come with a guardian over 21, because kids get into all sorts of trouble when left unattended. Some become dirty rock musicians.
The Ladder is not a scary room. There will be no jump scares. However, we like telling dramatic stories, so we will be making use of intense light and sound cues here and there. We can't imagine anyone would find it upsetting...but people are mysterious.