After someone pointed it out, we have fixed an error in the text of the coin door which may be misleading for players. The text now says that you need a copper coin instead of a bronze one.
In addition, we added a singular painting in one of the hallways after we discovered that the painting had not been added into the game. Since we don't want the work put into the painting to be wasted, and we think the painting looks cool, we added the painting with a tiny bit of lore text.