Masterpiece, Let Me In.

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

The visual and audio assets in this game (illustrations, character standees, card art, full-screen CGs, backgrounds, UI parts, looping videos, background music, and sound effects) were created during development with the assistance of generative artificial intelligence (AI) tools. AI output is not used as-is. For every generated asset, the developer manually curates, retouches and corrects, composites, removes backgrounds, trims margins, adjusts color, edits video length and loops, and performs quality checks before the asset is finished and built into the game. There is no live-generated content: the game does not generate any new content with AI while it is running. The characters and the "masterpieces" are entirely original, fictional creations drawn from the compositions and motifs of public-domain paintings (works whose copyright has expired). They do not depict or reproduce any real person or specific photograph, and all characters are fictional adults (18 or older). We affirm that this game contains no illegal content.

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.