Honeslty man your idea doesn't have to fit the theme perfectly! From my understanding game jams are all about just sitting down and making something and getting it out there. Whatever it is!
You made me feel better i was exhausted last three days thinking in idea that fits the theme but now i will make any idea but i will try to make it related to the theme thank you 🌸
What might help is just start making something you can mold into something else later, Like a platformer or top down action game and then feel out how to implement the theme into it. Good luck boi