"The hum" is so intriguing, I was sad that that path didn't continue! This is a great world so far, and I'm curious to know how you came up with the storyline. The looping story is also really immersive. I agree with your peers that the end feels abrupt - and I'm curious to know where else you would go with this story.
Also, LOL at the brooms, the switch, and the void.