When I said it's not "
an efficiency room"
, I just meant that it doesn't require
macro-efficiency; that is, there isn't a timer for solving the room as a whole. The puzzle does require micro-efficiency, reforming fluff before the roach touches the pressure plate.
I had another look just now, and it can be made easier:
Click here to view the secret text
×The staff can also push individual squares of fluff, and after every turn, these squares become puffs if they can't form a stable fluff blob.
Strike the fluff on a multiple of 5 and let the puff that forms move towards the roach. Then push a square of fluff behind it to reform the fluff, covering the pressure plate.
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50th Skywatcher