The ultimate goal of Hungry Shark evolution is, as the name suggests, to feed and grow your shark, finally evolving into a completely new species of shark. This gives the game more diversity than some others, allowing you to experience the nuances of playing as different species and the fun of seeing each shark's aesthetics. While most Sharks just eat fish, in Hungry Shark Evolution you will also be eating sea birds and people! Depending on what you eat, and how quickly, you earn more and more points, getting closer and closer to that elusive evolution.
The most basic goal is simply to eat. There are also certain things which can kill your shark, which obviously is something to be avoided. The further you swim and the longer you go without eating, the faster your Health goes down. Every time you eat something, your health goes back up a little bit.