Even if it’s only 1 sentence per room (it’s not), that’s still 4000 sentences. I’d guess this is at least a few hundred pages of written work (without downloading it and just based on what you’ve shared). That seems pretty substantial to me.
Not sure what the length has to do with handcraftedness though. This comment is handcrafted even if it is short.
Going by the sample rooms above, (27, 21, 24, 28, 27) words multiplied by 4000 rooms divided by 350–450 words per page yields 200–300 pages indeed. But if it's mainly exposition and not interactable I can see how it would become dull reading quickly.
Not sure what the length has to do with handcraftedness though. This comment is handcrafted even if it is short.