Vacation Cafe Simulator

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

We used AI to generate initial music tracks, concept art, and temporary translations into some languages. All materials were then thoroughly edited, reworked, and finalized by humans. Nothing went straight from the generator into the game.

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.