Thank you for playing and also taking the time to write a complete feedback, it helps me so much !
I'm glad you noticed the effort put in sound design !
As you saw with those Red herring decorations (that I confirm are just decorations), visuals are not my specialty. I agree that there is a lack a visuals queues, but the chest only opening on the lock is a bug, it was meant to open as soon as the "unlock" spell touches it. And I should'nt have picked a chest model with a real lock on it.
As for the 6 golden keys, they must be inserted in the 6 black mechanism around the door structure, I should have put a little VFX here to highlight them.
Thank you again for taking the time to play and write great feedback !