It's a fun game, but it's kind of unfair. The more points you get, the more you grow, and the more options you have in terms of what you can eat. So, as you grow bigger, the game gets a lot easier. By a certain point, all you have to do is swim around and eat everything in sight. So, unlike most games, the beginning is the hardest and it gets easier the farther you get.
BTW: The squid that swims along the bottom will ALWAYS kill you, no matter how big you get. So, watch out!