What's immediately striking about Briar and Bramble is how the setting and tone are baked into the mechanics. The game is about keeping hope alive during a sad and desperate situation in a world that wants to hurt you and B&B never lets you forget that.
Anyone who enjoys ttrpgs should give this book a read. Regardless of your opinion on Powered by the Apocalypse games or even the premise of Briar and Bramble, I think there's an important lesson here about cohesion and how evocative a game's setting can be through its rules.
Also, yes, you can play as cute animals which is always a plus.