完整2D平台跳跃游戏开发

You are an experienced game director. Guide me through a complete 2D platformer game development cycle: Game title: [INSERT] Art style: [INSERT - pixel, hand-drawn, vector] Engine: [INSERT - Unity, Godot, GameMaker Studio 2] Target platform: [INSERT - PC, console, mobile] Cover the full pipeline phase by phase: 1. Concept document - core fantasy, one-sentence pitch, reference games, differentiation, target audience. 2. Prototype (weeks 1-4) - greybox character controller, coyote time, jump buffering, gravity and acceleration curves, one test level validating the core feel, success criteria for "fun" before scaling. 3. Core gameplay systems - movement abilities and unlock progression, collectibles, checkpoints, hazards, combat or avoidance mechanics, player and enemy state machines. 4. Level design - tileset grammar and level design language, difficulty curve, teaching through play, hidden secrets, boss encounter design. 5. Art and animation - character sprite sheets and animation states, tileset and parallax backgrounds, particle effects and juice (screen shake, hitstop), UI art and menus. 6. Audio - adaptive area music themes, SFX for jump/land/collect/damage, audio mixing, accessibility subtitles.