The Memory Library

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

Pre-generated AI-assisted content included in the game includes character and enemy sprites, backgrounds and other visual assets, background music, most audio assets, narrative text, and localization.

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.