Unity Top-Down Shooter Game (iOS + Android + Web)

I need an experienced Unity developer to build a top-down 2D shooter game for iOS, Android, and Web (HTML5/WebGL).

GAME FEATURES:
• Top-down view, wave survival gameplay
• Virtual joystick controls (mobile) + WASD/keyboard (PC)
• 4 weapons: AK-47, AWP, MP5, Deagle
• 4 enemy types: Normal, Fast, Heavy, Boss (every 5th wave)
• Health & armor system
• Pickup system (health, armor, ammo)
• Score, kill counter, high score
• Sound effects
• Character skin selection (7 colors)

DELIVERABLES:
• iOS build (.ipa) for App Store
• Android build (.aab) for Google Play
• Web build (HTML5)
• Full source code

I already have a working HTML5 prototype that I can share as reference. Looking for milestone-based payment: prototype → alpha → final release.

Please share your Unity portfolio and any cross-platform titles you've shipped.