Jetstream

Jetstream launched on April 2, 2019 as a complete puzzle game with 100+ hand-crafted levels and 14 mechanics. Shortly after launch, a patch on August 20, 2019 added quality-of-life improvements and teased that a major new feature adding "a lot more Jetstream content" was in the works, estimated to be done "in the next few months." However, no such update was ever announced or released — the August 20, 2019 post is the last developer communication on record, now nearly seven years ago. Given that the teased content never materialized and all developer activity ceased by August 2019, the game should be treated as having shipped as a finished product. The only DLC ever released was the Original Soundtrack on launch day. The store description makes no reference to future content or updates, presenting the game as a complete, self-contained experience.