So basically sit as still as possible
Moving, jumping, shooting, etc, all use power, so even just moving to get a power up can drain you. So, you basically get stuck sitting as still as possible until absolutely necessary to move to dodge, or move a minor bit to get a power up. But when the missles barrage from the sides and you have to jump a lot, you quickly lose that power...and you can get screwed pretty fast. It's an interesting concept and decent game, but not very forgiving.