Inner Space

Inner Space is a horizontally side scrolling shooter where you control a spaceship and must blast wave after wave of alien ships over nine levels. At the end of each level is a boss and these take a number of shots before destroying it. If you touch any ship or bullet then you lose one of five lives and when all lives are gone it is game over. Every time you destroy a wave of ships, an icon moves across the screen and when collected gives you a better weapon.