Opa-Opa

All the enemies emanate from a circular generator, usually found in the middle of the stage. Each time it ‘charges’ it releases a batch of aliens but you can reset the charger, thereby delaying their arrival, by passing over it. Obviously this diverts your attention from collecting the coins though, and this must be done to finish the round (plus the larger, more valuable ones shrink down to small ones if you leave them too long), so you will inevitably have to contend with aliens to some degree.

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