Tilky Engine

The developers describe how their game uses AI generated content like this:

AI-Generated code has been used to help speed up development, debug code, and optimize core systems. All engine architecture, structural logic, and tool designs remain fully custom-built from scratch. The final compiled software consists entirely of human-written and human-reviewed code to ensure strict stability, performance, and integrity.

Required on Steam store pages since 2024. It covers content that ships in the game, on its store page or in its marketing — Valve does not require a disclosure for AI tools used during development, so this says nothing either way about how the game was made. Check it on Steam.