A similar game is The Expression Amrilato, a love story where you gradually learn the language Esperanto. After beating the game, you've learned a real language

A similar game is The Expression Amrilato, a love story where you gradually learn the language Esperanto. After beating the game, you've learned a real language, and can now speak with people from around the world. You also learn, however, an idiosyncratic writing system which is only useful within the game.