Coral Shallows is a browser-native action RPG set across a sun-drenched coral archipelago, built in one month with my son for Bruno Simon's Three.js Journey Stylized Nature challenge. Terrain, corals, water, sky, enemies and effects are all generated procedurally at runtime: six biome islands linked by tide-gated causeways, tide shrines that raise the drowned roads, and the Tidebreaker King waiting at the end. It plays just as well on a phone or tablet as on desktop.