Here is my plan for the Phoenotopia: The Lost Journey. This version is the free alternative to the existing sequels.
Partially redrawn graphics for the legacy areas and features.
The Unit 66, the final boss in the legacy Flash version, which was originally accessed by defeating the Master Computer, is replaced by the Great Boss of Earth, the pivotal boss that diverges between the legacy chapters and the new chapters. The latter boss is also far behind the halfway point of the entire journey, as the world is more than twice bigger than the former!
Greatly expanded world (about 3 times bigger than the legacy Flash game).
More collectibles and weapons with some quadratically growing numbers.
New bosses and enemies.
Semi-endless game - No true endings, but fake endings are worth a great rebirth.
Vastly rescaled player stats, from the start to the end.
New music (including the extended versions and remixes of the old songs).
Experimental development version 1 - "The Great Update"
Experimental development version 2 - "The Great Tweaks"
Experimental development version 3 - "Mastery Update"
Location Danger Index (LDI) - Numeral-based location danger scale
World's Former End (WFE) Summary - An informal summary about the introduction to the formerly secret area of Phoenotopia.