Not as hard as it sounds. Take your time and max out your Evolution, Symbiosis, and Transformation abilities as soon as you can to make your life easier. Do not get backed into a corner or surrounded by three or more enemies at once as you will die quick, even with your abilities maxed out. Beware, beware, beware of the Terminators and Spargs as they will make short work of you. Upgrading Rage will also help you out since using it refills your health some each time you score a hit on an enemy. Do NOT try using the Rage ability on the Terminators as they will just knock you away every time you try. Use your Alien-view to see them and do not get cornered by two or more them.