歩き回って周回できるローポリ惑星のオープンワールドゲーム

Build a cozy low-poly open-world game on a small spherical planet, delivered as one self-contained HTML file using Three.js. Split the globe into distinct biomes: green forest, sandy desert, snowy tundra with ice crystals and dark soil, each with matching trees, rocks and small wooden cabins, plus a winding river and footpaths. Use a soft, saturated palette against a dark teal space backdrop with drifting clouds. The player character walks across the surface with the planet curving beneath them, and the camera can orbit by dragging and zoom with the scroll wheel. Add keyboard controls for walking, jumping and interacting, shown in a slim control bar at the bottom of the screen. Include small quests or points of interest announced by a short caption card, such as tending a campfire. Done means you can wander across every biome, interact with objects, and orbit the whole planet smoothly at a steady frame rate.