Colorful Children's Puzzle App

I'm looking for an engaging and fun puzzle app for children aged 4-8. The app should feature:

- Drag-and-drop puzzle solving
- Reward system (stars, applause)
- 10–15 puzzle levels (shapes, animals, objects)
- Sound effects & child-friendly UI

Design will be provided if needed.

Ideal skills and experience:
- Experience in developing mobile apps for children
- Strong UI/UX design skills, especially for child-friendly applications
- Proficiency in implementing reward systems and sound effects