I found out you can climb a wall with the help of the hair. It's the previous room to the final boss hall
And I don't have any images of this, but the game froze when I interacted with the silver coin (I think it was in the room before the locked door, where they remind you you need fire, but I'm not sure, sorry-). The game was still working because I could hear the menu open and close, it was only a screen problem
I'm using PC by the way, and here are some reference images!
PS: Thank you for making such an amazing game! I'm enjoying it a lot!
