Mouse Guard is a graphic book by David Peterson, which is a wonderful premise. It has an official RPG which is  based on the Burning wheel system.

MouseGuard: http://www.mouseguard.net/

There is another mouse RPG called MausRitter, and I review this great little game.

Maus Ritter: https://losing-games.itch.io/mausritter

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Website: https://petejones.neocities.org/

Blog: https://dragonsarerealpodcast.tumblr.com/
OSR Anchorites on Audio Dungeon Discord Server: https://discord.gg/VpRjr3A 

Opening Music

Fireflies and Stardust by Kevin MacLeod https://incompetech.com
License: CC BY (http://creativecommons.org/licenses/by/4.0/)

Closing Music

"Fretless" by Kevin MacLeod https://incompetech.com
License: CC BY (http://creativecommons.org/licenses/by/4.0/)