One Stroke Hunter

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

AI tools were used to assist with parts of the background music and artwork during development. In addition, AI-generated translation was used for all languages other than Japanese.

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.