Not trying to be pedantic lol, but Ellenor already knew what she was inside the human disguise, she didn't look in a mirror and think OMG claws I'm an insectoid! It was a tomato surprise to me, though! SPLAT!
Twist ending, sure, it's that too. Not Planet Of The Apes level twist ending, Statue of Liberty head on the beach. But okay.
Arguing over definitions is almost as fun as the contests, where's ComicBent when you need him?