Thank you, this is exactly the kind of note I was hoping for — and floor 3 is where I wanted people to end up.
Through walls: intended. They're shadows, so walls don't stop them, which is also why they can get behind you. I should say that on the page.
Lit places: they can't come inside the coloured area, but they do drift across its edge while they're floating around, and from the player's side that can look like they walked in. If you saw one sitting well inside the colour, that's something I'd want to reproduce — do you remember which floor?
Flash: when it didn't push them, do you remember where they were relative to you, and whether your torch was already cracked? The flash shrinks with the cracks right now, and I'm not sure that's the right call.
Minimap filling only where you've walked is intended, but you're not the first to say it, so I'll look at it. And "taking ground back" is exactly what lighting a lamp is supposed to feel like, so if it didn't, that's the note I'll build from. Thanks again.