Super interesting concept and take on the theme! I've seen this concept in movies, but I don't think I've played a game where you defend other people from your monster self before.
I like how there were a bunch of different tools you could use to stop the monster. The tools' names could be more visible, I didn't notice the names while playing, only afterwards when I went to check if the name showed up.
I think this concept would work in a bigger game as well.
PS. The title is pretty clever!