Château Pluie: The New Cellar Keeper

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

Pre-generated AI was used for wine label illustrations, the animated main menu background, the full-screen introductory image, in-game radio music, and some sound effects. All AI-generated content was reviewed and integrated by the developer. No AI content is generated while the game is running.

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.