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Fantastic addictive game.
From the description:
Magnetix is a simple and addictive puzzle/arcade game of attraction. Enemies become attracted to you as you enter their field. The smaller they are, the greater the magnetic pull. Use the point and drag mechanism to weave your way through 70 levels of increasing difficulty, starting from basic, all the way through to downright insane!
Looks like $0.99 to me…