Carnivores are tough to keep alive without extincting everything, but regardless of your diet, you should be able to take whatever path (peaceful, hostile, or balanced) you like. You certainly don't have to eat all your kills, or socialize to survive. If you do starve to death, you'll respawn without further penalty.

Playing for balance is hardest because you do need both combat and social parts, but you don't need to have them all at the same time. A single trip to the editor lets you trade out all of your abilities for different ones. The omnivore power from the cell stage also makes both tracks easier.

You can buy speed, sprint, jump, and glide upgrades to improve your mobility. I always buy at least the maximum speed and sprint.