Девочка, которая провалилась в Волшебное Подземелье и утащила с собой развеселье

The shadow world felt so vivid and mysterious—I'm curious whether it was inspired by folklore, personal experiences, or pure imagination.

There were moments that felt a bit darker than typical children's stories, but the playful tone kept it light. How did others interpret this blend?

The world-building was so rich and inventive—I'm wondering what the creative process was behind designing these characters and environments.