It was little hard to find a golden key, I just started moving to the right and didn't find something. Maybe it will be good if you will place invisible walls.
I thought that the golden key can be located somewhere near of main door, but I accidentally saw a red light from the left side
I expected to see jump scares, but there weren't any (and thank you, I don't like jump scares)
Problems that I found
The ghost from the gold key freeze you forever
On my first playthrough I was not able to pick up a X piece, I don't know what happened on the second playthrough, but it went good.
The lighting on the ground is a little broken
Mouse speed is very high for me
White text on white buttons in the pause menu
Thank you for the game
I was surprised when I read that your game uses ProceduralAudio script to generate audio sounds effects. This is cool! I think, you should use more this script for make something interesting.