How to Use
• Use arrow keys or WASD to move your spaceship around the screen • Press spacebar to shoot projectiles at incoming enemies • Destroy enemy invaders before they reach you or shoot you down • Each enemy destroyed increases your score • Avoid enemy projectiles - getting hit ends the game • Enemy invaders move in formation and gradually descend toward your position • The game gets progressively more challenging as you advance • Try to achieve the highest score possible before being defeated • Click Start to begin, and Restart to play again after game over