Theorycraft about possible puzzles

So today me and my gf finished the game with the 2. ending and I still had some question and theories in me I’d like to share and discuss.

First I’ve seen the the Emoji/ face riddle witch we did not solve jet.I assume that you have to play the notes made by the manticore at the end. But I’ve also seen a lot of faces on the many pillars along the way. I haven’t checked yet if they are indeed different or not bus could this be another secret?

Also is there anything to to at the end of the manticore? On the other hand you have many pictures witch I assumed was lore revealed by the uv light.

Could this be a manoeuvre at the end to reach some point like the rabbit hut? I mean you are kinda rinding him ( inside not on top but let’s not be picky)

Feel free to share your thoughts or other theories.