Atari 2600 Invader X

Press F1 or Spacebar to start game.
Use the arrow keys to move and the Spacebar as the action button.

Invader X Story

Marooned on the ice planet Krybor, you watch legions of eerie creatures scream overhead. 
They hover ominously. They give you no quarter. Attack and destroy them, or be destroyed! 
Armed with your Laser Cannon, you confront the ultimate challenge: 
SURVIVE!..................Or so you thought. Seems like that was just the training mission. 
Now prepare for the REAL THING!! INVADER X!!

Invader X Neotokeos Classic Videogamer