I would really see this in a sort of incremental where you are in a world with a lot of different currencies or just a lot of different values that you don't know at first, and maybe buy upgrades like a calculator/convertor that would need ressources to work (otherwise you would use it all the time) or a book like in the bottom left that tell you the values of every coins. I do think that trying to make a full game will be hard because you have to change or add a few mecanics to make it playable for longer or feel a kind of progression and this could take away the beautiful atmosphere the game has right now.