It seems like Cunningham's Law applies to game jams too: the best way to get people to play your jam entry is to make a game with an objectively incorrect title. As one of the few people whose favourite Prismriver is Merlin, the moment I saw this game's title, I was honourbound to figure out why someone would post such libel. To my surprise, I was met with a charming little game starring everybody's favourite poltergeist trumpeter, thus revealing this game's true nature: a deceptive ploy to convert everyone to the Merlin fanbase.
Jokes aside, even as a basic prototype, this is pretty nice! The artstyle is absolutely adorable, and the 2.5D aesthetic vaguely reminds me of the first Paper Mario game. The mechanics don't seem to be fully implemented, unfortunately; I couldn't possess anyone, but I could pick up and toss the person in front of the shrine. I was able to steal the Yin-Yang Orb, but placing it in the "IN" bag locked Merlin in the holding state, preventing her from taking anything else. However, what does work shows promise, especially given the short turnaround time, and I'd love if this concept was elaborated on further!
Overall, while the current build is indeed pretty simple, it definitely has the potential to be incredible if it were fleshed out into a full game.