Alien Alley

Alien Alley is a demonstration game for an instructional book "PC Game Programming Explorer". It's a vertically scrolling shooter in which the player destroys incoming alien ships for points. Enemies enter from the top of the screen and fire toward the player’s position; shots reduce the ship’s shield, while direct contact with an enemy causes immediate destruction. Play continues until the ship is lost, with the objective of surviving as long as possible and achieving a high score.