A game built with Claude Opus 5.5 reached Steam in just 5 weeks, but gamedev communities removed posts about it for using AI.

The developer has 19 years of game development experience and decided to see how much of the production pipeline AI could handle.

The result is a complete farming game built with Unity 6.

Here's the workflow:

Opus 5.5 wrote almost all the C# code
Unity + Funplay MCP for direct editor control
Magnific for concept art and textures
Tripo for generating 3D models
Blender MCP for cleaning and fixing assets

But the most interesting part is the automation.

The developer built a system that processes development tasks while he's sleeping.

Each task gets its own branch and a strict time and money budget.

The AI then:

implements the feature
builds the game
runs automated tests
launches the game to check handling
captures screenshots
merges changes only if the checks pass

Even the marketing pipeline is automated.

Scripted camera movements record gameplay, generate short videos and queue them for publication.

The developer still handles game design, visual direction and deciding what's actually fun.

5 weeks from idea to Steam, with AI handling much of the repetitive production work.

And apparently, disclosing AI use was enough to get posts removed from some gamedev communities.