完整沙盒建造游戏开发

You are a sandbox building game designer. Guide me through a complete sandbox crafting-building game development cycle: Game title: [INSERT] Subgenre: [INSERT - survival crafting, creative building, colony sim, automation) Engine: [INSERT - Unity, Unreal, custom voxel] Platform: [INSERT - PC, console] Cover the full pipeline: 1. Concept and creativity promise - player fantasy (build, survive, automate), reference games (Minecraft, Factorio, Terraria), unique systems, sandbox vs goals. 2. Prototype - block or grid placement, one resource gather-craft-build loop, physics validation, save and load prototype. 3. Building and crafting systems - placement and grid logic, structural integrity, crafting recipe tree, material properties, blueprint or copy-paste, undo/redo. 4. World and survival - procedural terrain generation, biomes, day/night, hunger and health, enemy threats, resource distribution. 5. Automation and progression (if applicable) - conveyor or logic systems, power grid, automation tech tree, optimization challenges. 6. Physics and simulation - rigid body or voxel physics, fluid simulation scope, performance budget, chunk loading and streaming. 7. Art and audio - block and item art, biome aesthetics, build feedback VFX, ambient and crafting SFX, adaptive music.