I enjoyed the game, I was looking for something simple and sweet and I found it.....but I have questions.........
When I wrote the story, it was that the creature is supernatural kind of like a cryptid. He’s alive and can’t fall because he can float off the ground. The trapping is more kinda magical, similar to a salt circle. His “friends” sealed the building so that he can’t leave (because the creature looked different and creepy) but once you’ve opened the door, it broke the seal and he can leave.
I had in mind a story about not judging a book by its cover but I’ve heard other theories which are really good. The metaphor you said works too even if I didn’t think about it while writing it :)
Thanks for the questions! I hope this answers them :D