4 days and almost 4 weekly Opus limits: a multiplayer A-10 flight sim that runs in a browser tab

After 20 years as a developer, this is the first project where I barely read the code. I started it on Monday from an empty repo. It's an A-10C flight sim with multiplayer dogfights, a clickable cockpit, a whole island built from real elevation data, and live real-world weather and time of day. Free in the browser, no download: a10canary.com How Claude helped: I wrote a full spec first. Claude Code split it into typed module contracts and ran parallel agents on them, each with its own tests. There are 500+ test files now. No downloaded 3D models. Claude drove headless Blender to build the jet from technical drawings. No hand-made textures, everything is procedural shaders. Terrain comes from elevation data and OpenStreetMap. The multiplayer server, bots, overflow rooms and deploys were all built and shipped by agents. I mostly check the structure now and rarely read the code. The tower, crew chief and AWACS radio voices are ElevenLabs. What it cost: almost 4 weekly limits. Feedback welcome, especially from anyone who flies sims. Edit: added a line about my background at the top.