Adventure Time RPG

I recently discovered that there's a TTRPG for the animated series Adventure Time which is my all-time favourite cartoon. But, I was kinda annoyed and saddened to find out that it was just another 5e supplement which I'm currently very burned out on cause it's all started to feel very same-same to me now. If you were to recommend a RPG system to use that understands wacky silliness of the series but at the same time has the ability to go really deep when I needs to (as the series can have it's more raw and darker moments) what system would you recommend using for a "hack"?

Personally I was thinking PbtA, but I also want to hear other people's opinions as well before deciding 👍