itch.io

Yes, it depends, but for the basics and starting from your description; you could make a puzzle for opening cages, using keys, or more creative scenarios using medieval tools for opening doors (in puzzles of course). If the prisioner needs to hide from catchers or knights, maybe a simple system where the player is forced to listen close movements or something like that. But we need more details.

Looking for a writer? I'm an experienced writer if you need a plot for your game project. I'm also spanish!