Plazmoids! for

From TB Labs:

Plazmoids! is an arcade game for Palm OS that combines superb high resolution, 3D-style graphics, sophisticated visual effects, and addictive techno music and sound. But what makes the game unique is its unusual gameplay based on original physics. We are proud to present this breakthrough game that not only gives hours of amusement and fun, but also changes the look of the arcade genre. Unlike classic space arcades, Plazmoids! employs the physical laws of acceleration, momentum, and magnetism. You are in control of a spacecraft that scours space for plazmoids - valuable energy resources - and collects them through the use of a hi-tech magnetic beam. But since you are not alone in this job, get ready to face numerous enemies, each with their own features and behaviour, master several types of weapon, and upgrade your tiny ship to a powerful space fortress. Inpredictable space bodies, coward mines, and devastating enemy bases will turn your job into a hell. Will you stand it, clean up fifteen sectors of the galaxy and win the war for plazmoids?"