Space Fuck!

A father gives his son a space suit on his deathbed. Using the associated jet-pack the son ascends from the subterranean tunnel system he has always known as home. On the planet's surface he discovers a metropolis in ruins, and a sole survivor who tells him, "Planet "X" did this." Leaping in a nearby legged tank, he takes to the sky. All of this the player is able to control by using the arrow key...