Hitting the bonus pieces a level as early as possible. These are the blue colored pieces which give you the super bouncy ball, extra points and multipliers.
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Save power-ups, such as the rocket, until absolutely needed.
Hearts will usually refill over time. To regain all of them instantly, advance the time on your device by a few hours. Afterwards, set the time back to its correct value.
Your first two shots are the most important to earn points. Make the most of them to get high scores.