Playful UI/UX Redesign for Kids' Mobile Game (FitFit)

I am looking for a creative Game UI Artist to completely redesign the interface for FitFit, a fitness-based mobile game designed for children. I have a 3D artist handling characters and level environments; I specifically need a specialist to overhaul the 2D interface elements to make the app look fun, premium, and kid-friendly.

Scope of Work:

Interactive Elements: Redesigning all buttons, toggles, and sliders to be "chunky," colorful, and satisfying to click.
Game Screens: Main Menu, Level Selection, Rewards/Pop-ups, and Settings.
In-Game HUD: Health bars, progress trackers, and action icons that are easy for kids to understand at a glance.
Visual Style: Bright, energetic, and polished (think along the lines of Toca Boca, Roblox, or Candy Crush).

Iconography: Custom-designed icons for fitness actions and navigation.

Technical Deliverables:

High-fidelity UI mockups (Figma or Photoshop).
Exported Slices: All buttons and assets exported as transparent PNGs/SVGs for my developers to integrate into Unity.
A consistent style guide (color palette and kid-friendly typography).

Requirements:

Experience in Kids' App/Game design is a must.
Strong sense of "Game Feel"—knowing how to make a UI feel alive.
Please provide a portfolio showing colorful, playful interface work.