Simple iOS Game Prototype

I need a small-scope iOS game put together as a working proof-of-concept. The focus is mobile app development, specifically a game, and my goal is to see core gameplay mechanics running on an iPhone without polished art or complex levels.

Here’s what I’m after:
• A playable prototype built in Swift, SpriteKit, or another lightweight engine you recommend for quick iteration.
• One short game loop (start, play, game over) with placeholder graphics and sound.
• Basic touch controls that feel responsive.
• Xcode project files plus a compiled .ipa I can install for testing.
• A brief read-me explaining setup, key classes, and how to swap assets later.

Keep scope lean—think minimal UI, no backend, and no in-app purchases for now. If the prototype is fun and stable, I’ll consider expanding the project with more levels, art, and Game Center features.