Castle Keeper

Castle Keeper is a 1-player arcade game for the 8-bit Atari.

The player moves about a randomly generated castle from a top-down perspective, and tries to shoot the enemies before time runs out. The player loses a life if they touch a wall or an enemy. After killing all enemies, a door opens allowing the player to escape the castle. There are three levels of difficulty, and the player starts with five lives. Each level completed increases the number of enemies per level.