I want to create a first-person action/adventure game tailored for iOS and Android. The immediate goal is a complete game design document that captures the core loop, touch-based controls, combat and exploration systems, level progression, art/style guidelines, and a clear monetisation model suitable for mobile storefronts. The work finishes when I have: • A concise concept overview with player fantasy, setting, and hook • Detailed mechanics charts (movement, combat, puzzles, rewards) • Level flow diagrams that fit short mobile play sessions • UX wireframes showing on-screen controls and HUD placement • A lightweight content roadmap and milestone schedule for production Unity or Unreal Mobile familiarity is preferred so proposed features stay technically feasible. All writing, sketches, and diagrams should be organised in a shareable GDD (PDF or Google Docs). Clarity, originality, and mobile-friendly design choices will be the key acceptance criteria.