E.V.O.: Search for Eden

Combining traditional platforming mechanics with leveling mechanics originating from RPG's, E.V.O. involves the player navigating a creature through a number of side-scrolling levels while undergoing bodily evolution to cope with ever-changing environments. Spanning a period of over a billion years, the game's story involves Gaia, daughter of the sun and mystical embodiment of the Earth, guiding the player through five distinct geological periods of the planet's history. (Wikipedia)