The Ice Cave

Description
The Ice Cave is a 1-player arcade game for the Apple II.
The player controls a spaceship which can move horizontally and fire vertically. Set within a cavern of ice, the player must combat a number of alien creatures which attempt to fire on the player. The player loses a life if they strike enemy fire. When the player clears all enemies on a stage, they advance to a more difficult level. The player starts with 5 lives, and when all are lost it's game over.