Septerra Core: Legacy of the Creator

Septerra is controlled by the Chosen, who live at the top of the world, consuming massive amounts of energy and throwing the "waste" down, to lower levels. Maya, a "junk scavenger" who lives among those wastes and earns the living collecting junk, unexpectedly comes into contact with the Chosen. It appears that their goal is to reach the legendary Gift. Maya and her friends decide to face the Chosen, and ultimately discover the true history of the planet. (mobygames)