Ok. First thing to remember here is that it's a board game. For children.

Second thing to keep in mind is Robin Williams survives alone in the jungle for decades with absolutely no survival skills whatsoever.

Jumanji is a game about thrills. It will scare you, bring you as close to annihilation as possible, but in the end, it will not kill you.

Jumanji will not let you die when trapped inside it.