Airtone

Airtone launched on June 8, 2017 as a VR rhythm game with 25 tracks. The developer issued a small gameplay update on August 5, 2017 and then shipped a free content update on November 29, 2018 that added five new songs. That November 2018 update is the last recorded developer communication of any kind — no posts, patches, or announcements have followed in the years since. The store description describes the game as a complete package with 25 tracks, a full story, and defined difficulty tiers, with no mention of upcoming content. Given the nearly 8-year silence since the last update (last communication November 29, 2018), combined with the absence of any announced or unreleased DLC, and the game's nature as a self-contained rhythm title, the content appears to have been finalized with that November 2018 update.