You score one point for each squarkix you touch. The first few levels of the game are easy: squarkix are big and slow. But each new level brings smaller, quicker squarkix: use your fingertips to touch as many squarkix as possible.
You can also turn on or off the sound effects. Note by the way that you can listen to your favorite iPod music while playing Squarkix.
To clear the score list, touch "Reset score". Beware: this will completely erase your score records.