Three.jsでゼロから作ったアイソメトリックのダークファンタジー・アクションゲーム

Build the first level of a 3D isometric action game as a browser project using Three.js, with every asset created in code and no downloaded models. Set it in overgrown fantasy ruins: mossy stone arches, pillars, broken walkways, obelisks, foliage, drifting fog and moody lighting with glowing cyan portals. Add a hero seen from a high angled camera who moves by clicking, attacks enemies, and uses abilities from a hotbar at the bottom of the screen. Include health display, a minimap in the corner, a game title, floating combat feedback, magic summoning circles and a light beam effect for key events. Give the level a clear objective with enemies to defeat and areas to reach. Run the game, play through it, and fix bugs until movement, combat and interactions work. Deliver a runnable project with instructions to start it.