You know what's worse than dumb one-off gimmicks? Trying to do dumb one-off gimmicks after taking evening meds. One of these days, I'll listen to myself when I say to stop recording episodes while heavily medicated.
This so-called dungeon is the definition of filler. Drip-fed combat with no challenge, a 'puzzle' that isn't a puzzle, and no story ramifications whatsoever.