I think I may have discovered a bug? I'm at a point where I've saved ~5 witches and I have one door key and another that I could pick up if my hands were free, and there is a set of double doors that won't open, and I can't find another place to go. It's right after the note that begins "Only witches can cast spells." Normally I'd give up, but I'm REALLY enjoying this game so far. Can you at least tell me if I'm missing something?