Lume

Lume released on May 9, 2011. The store description explicitly describes this game as "Part 1 of a larger, ongoing story," indicating that it was originally conceived as the first installment in a multi-part series. However, there is no developer communication, DLC listing, news post, or any other official signal indicating that subsequent parts were ever released or are still in development. The game has been available on Steam since 2011 with no apparent post-launch content updates. Given that over 15 years have passed since release with no follow-up content announced or delivered, the "larger, ongoing story" language in the store description appears to reflect an ambition that was never realized rather than a credible current commitment. The game itself is a complete, self-contained experience as shipped — it simply was not followed by the sequel content originally envisioned.