The idea is funny, and I like the art style; it looks really good. It would be nice if the mouse was less stiff - maybe some small animations or basic rigid body, because now the movement feels quite wooden. The walking sound is creepy and becomes a bit annoying over time, but on the other hand, it makes sense - we are a small mouse, so for us, this sound IS annoying and creepy. Anyway, with some more adjustments, it could be a really fun experience.