It seems you're asking for a review related to — but as of my current knowledge (last update: July 2024), there is no official Version 2.2 of Geometry Dash , let alone a "v21" (version 21). The most recent major update is Geometry Dash 2.2 , released in December 2023 after a long wait.
If you are looking for a report on the 21st official level, is the "v21" level. Difficulty: Insane (12 Stars). Composer: MDK . Status: Verified and available in the base game. 3. Current Verification News (April 2026) geometry dash v21 verified
Released in January 2017, Update 2.1 was the game's longest-running version. It seems you're asking for a review related