Postmouse

From the students of the Animation Workshop, Postmouse is a third-person single-player puzzle platforming game about a timid mouse who has to go on their first adventure to deliver mail. Having always dreamt of the world beyond their little post-office, Postmouse is emboldened to enter the great unknown. Meet charming animals, solve precarious puzzles and explore ruins of a time long past on your mission to deliver letters to those waiting to hear from their loved ones. (source: Steam)