Firstly, I wanted to say thanks to Mur for her diplomatic way of phrasing which she "camp" she belongs to, without stroking anyone's fur backwards. Well played.
Quantum mechanics aside, I was just grateful to hear the rare "ailurocentric" story, putting cats in a positive light for once. Ever since that Bond villain and his Persian, movies (more so than books) seem stuck in the trope of casting cats or cat owners in the role of badguy, or basically, "dramatic foil", to the good guy and his dog again and again. It gets a lil old, and hearing a cat story for cat people feels really good. I think the last cat-as-hero story I recall on EP was His Master's Voice, which even still, centers on a canine protagonist, but hey. (I still play that one over and over.)
Also a positive spin on the cat lady! I was not bogged down by the Fairy Catmother's powers or where she gets them, anymore than I am about Santa Clause's powers. (Hmm, same powers.) This is a simple what-if fable about where stray ideas go (like stray cats), and of course, what happens to naughty villains.
I did not see the ending as a "dark turn" or ugly, I was a bit surprised by people's reactions to it. It was your standard bad-guy-gets-his ending. Besides, it stands to reason that, with all the imaginary cats she's been pulling out of imaginary boxes, she would have loads of leftover imaginary radioactivity-triggered poison assemblies just lyin around her imaginary inside-out cat mansion in the sky. Me like!