In that case I don't know what else to do. I have tried a bunch of things in the meantime, but this game has many programming quirks that could mean nothing.
For instance, in the bird area there is one last room accessible only by being a pig, which has many doors in the walls that teleport you on the opposite side of the room. Except the one on the far right that behaves differently and puts you in a different tile. It might be the start of a sequence (there are puzzles like that in many games), but I doubt it.
One thought that I had is that the fluffy creature will have a speech bubble for the fish, but not for the other creatures. In theory that would imply that there's a scenario where the strange kid with the horn in the everchanging room and the devs in the red room would have a speech bubble, if approached as the right creature. We know that the devs do say something from looking at the phone version of the game. So the question would be: with what other creatures can you access those rooms.
The everchanging room will always have a pig wizard blocking the entrance, unless you are a cat. But the wizard does give you a pig token, which means I could enter his room as a cat when he is still far away from the entrance and pick up his token after having collected the other 2, then transform into a pig and enter the room with the talking vase before the wizard would position himself in front of the door. Which is what I did and nothing happened ahah. That sucked, but I give myself some points for creativity.
The red room you can enter as fish(there is a token in the crack), as dinosaur man (the shark turns you into it), as a pig and as Nemedique. I've done them all and nothing.
I guess if you'd want to go hardcore you could play their previous game Hiversaires, which would allow you to translate whatever language that guy speaks in (he says LO KI WA). Maybe there's a hint there, but honestly I doubt the devs went that far.
