Windmill Builder is a retro-flavoured idle clicker built around a single hand-painted windmill on the open plains. Every tap on the rotor turns the sails, accumulates wind energy, and once a hundred units of energy have been gathered, a fresh sack of flour is sealed and added to the workshop ledger. Flour is the only currency in the game, and it is spent inside a parchment-styled workshop on three distinct lines of progress: Sail Mites that tap the rotor on the player's behalf, Stone Grinders that increase the energy gained per manual tap, and Gust Channelers that speed up the visible rotation while quietly multiplying every gain. When a run starts to plateau, the player can ascend the mill: a prestige rebirth that trades the current run for permanent millstone shards, each one adding a flat percentage bonus to all future flour produced. Backgrounds rotate between three sepia-toned plains of antique windmills painted in brown and gray, and every screen, from the splash through the three-page onboarding to the workshop, reflows for portrait phones, landscape tablets, and any other aspect ratio the device decides to present. The project is written in Flutter with a deliberately uncommon naming convention across files and classes, so the codebase reads as a single themed atelier rather than a generic template.