潜水艇で遊ぶ3D水族館ゲーム。魚の群れとサンゴ、モデル比較

Build a browser-based 3D aquarium game in which the player pilots a small round yellow submersible inside a glass tank. Use a sandy floor, rounded grey-green rocks, branching coral, fan corals and swaying seagrass, with light rays falling through teal water. Fill the tank with colourful low-poly fish such as goldfish that swim in shoals and react to the submersible. Add a third-person follow camera, a minimal HUD with a score or fish counter, a progress bar, a depth or distance readout and a zone title like a sunlit shallows area. Show short messages when a new fish joins the shoal. Start from a reference image of the desired look and generate everything from a single prompt, using Three.js with no external assets. Done means the submersible steers smoothly, fish move believably and the tank looks lively and readable from the default camera.