Sidewize

Sidewize ‘s plot revolves around four planets which get attacked by evil
aliens. Now the player buckles on a jetpack to teach them a lesson; not
entirely surprising by shooting them with a laser cannon. The planet order can
be chosen freely.

The game is a horizontally scrolling shooter in which the protagonist has all
directions to maneuver. This is necessary because enemies come in from both
sides of the screen. There are various power ups to collect which grant
advantages like improved weapons in six expansion stages, extra lives or a
protective shield.