Further changes were suggested by fans and incorporated throughout development. Sash Lilac, originally a hedgehog, became a dragon antagonist Doctor Eggman was replaced by Lord Brevon and the Sonic series' ring-based health system was abandoned. Early into development, DiDuro lost interest in creating a derivative work and reconceived the project as her own intellectual property. The game began development as a Sonic the Hedgehog fangame using characters created by DeviantArt user Ziyo Ling for its main cast. While the game focuses on fast-paced platforming, its levels are interspersed with slower action scenes. Aided by the duck-like Torque, they attempt to defeat Lord Brevon, who plans to conquer the galaxy. The player controls one of three anthropomorphic animal protagonists: the dragon Lilac, the wildcat Carol, or the basset hound Milla. Freedom Planet is a 2D platform video game developed and published by GalaxyTrail, a studio set up by designer Sabrina DiDuro.
