The rat is the best character. There's just no competition. (I'm lying, every one of them have equally great dialogue.)
I liked the concept of the toy family because it made the puzzle box feel like it has really been used before by someone in the past. All of the puzzles felt decently complex, with the nice mechanics of inspecting, using and combining, yet all of the lines of thinking were nice and easy to follow!
There's no clutter, it's simple, its straightforward, and now I cant stop thinking about that rat. Great Work!