This sounds a teeny bit like Liar Game.
I think it sounds fun! If you want to avoid meta gaming, which I agree would be a problem, try rolling dice to determine outcomes. It's simple and effective!
If a character dies because they did something stupid like jump off the boat, that's kinda...
I'm no where near professional or even hobbyist levels, but I think about it a lot! I've dabbled in interactive fiction games, since there are a couple programs that make programming those super easy.
While I certainly have played with Pokémon Go a bit, I'm mostly content to be left in the dust building my farm. X3 Thank you!
D'awww, thank you~.
Thanks!