New product to help kids got to bed! help

hi I am a university student studying product design, looking for some opinions on a product in the making that shines light through different cut out, e.g. princess, boat, castle. casting large shadows onto the child's wall to add something visual whilst the parent is storytelling before bed, the plastic cut outs will come in packs that link with well know fairy tales. any advice on the idea or other issues with bedtime would be great!