Thanks for the welcome!
Regarding the dice, technically the d20 isn't needed (unless something changes in development), but the typical dice from d4-d12 are all in play.
The core mechanics are basically skill checks, determining the success or failure of whatever it is you're trying to do. It's worth noting that the skill list includes things like "Scamper", which is used to do stuff like scurry across a busy street without getting stepped on, or otherwise use your mousey agility to get around. There is also a friendship die that you can use when helping a friend if they're using a skill you're not very good with, thereby encouraging teamwork because it helps compensate for your individual weaknesses. It's possible that additional setting/theme reinforcement could be added in development, but it will have to compete with a goal of simplicity and ease of learning; even so, I'm optimistic about landing in a sweet spot there.
Feel free to drop me more questions!
EDIT: Another good example of a setting-specific skill is Big Machines, which you use when you need to operate human-sized contraptions like keyboards or cars.