I thought this was extremely charming! (Yes, even the rap segment :P)
The narrative in general was rather adorable and tender. I know you say it's just a short demo, but it's a concept I'd love to see expanded on in the future if it's something you end up doing! Robyn seems like a character I'd like to spend more time inserting into, and I imagine the possibilities for remnants summoned could be endless ^-^