The real uniqueness of the game comes from the evolution system. At any time you can access the evolution menu and spend your evolution points. You can upgrade many parts of your body. Upgrade your jaws to increase the damage you inflict when you bite, your body size to gain more health points at the cost of maneuverability, your tail to gain speed. You can even add a horn to give you a weapon to ram enemies with, or a glowing lure that dangles from the front of your head and attracts weaker enemies into the reach of your jaws.