I've got several actually, but this is the one that's most fleshed out:

The entire "world" is set on an enormous dial, which itself is set on top of a massive mechanism of gears, all supposedly created by a Watchmaker and the Watchmaker's Servitors, which have all disappeared after the mythical War of Shattered Gears. By the time of the story, it has been eons since those mythical times, and anthropomorphic feline Basteti live at peace alongside humans in cities built out of salvaged materials and relics from the Gearworks deep below. However, a shadowy Rustite Cult has emerged with the goal of spreading the eldritch Rust across the entirety of the Mechanism, and have corrupted the Tickbeasts and Clockroaches into horrific abominations. Only a plucky group of adventurers, from sneaky Nimblemitts to powerful Steamguards and eccentric Alchemists will be able to save the world from Rust.