thrixel/build-world ? reverse-engineered prompt

Build me a playable 3D world in Three.js using this Thrixel workflow.

I want a bright tropical submarine exploration game where the player can move around, discover coral reefs, fish, hidden ruins, and a few simple points of interest to interact with. Make it feel polished and alive, with good lighting, smooth controls, clear goals, and a small game loop that gives the player something to do besides just swim around.

Use Thrixel for the 3D assets, and set up the scene so it’s easy to keep improving with follow up prompts. Please organize the world cleanly, add basic interactions, and make sure the experience can be published and shared when it’s ready. If you need to look up current docs online, do that.

Start with a solid first playable version, then leave the project in a state where I can ask for changes like more enemies, better animations, different biomes, or a bigger map.