Games like cubivore

Cubivore: Survival of the Fittest, known in Japan as Dōbutsu Banchō (動物番長, "Animal Leader") is an action-adventure video game co-developed by Saru Brunei and Intelligent Systems for the GameCube. It was originally published by Nintendo only in Japan on February 21, 2002. After Nintendo expressed intentions to not release the game in other regions, Atlus picked up the game and localized it for North America on November 10, 2002.

Development for Cubivore originally started on the Nintendo 64DD, but later was moved to the GameCube. The player controls a cube-shaped beast called a Cubivore, which eats other such beasts in order to mutate and become stronger. The game received mixed reviews upon release.