This game was written by my elder brother Ian after study of one of the Compute's Graphic books in order to experiment with use of the Atari's features, e.g. Display Lists and Player/Missile graphics, collision detection.
Gameplay requires landing your craft on the pads but at not too fast a speed and with no sideways movement. Navigate to the more tricky pads for extra points, but avoid touching the cavern walls and what we affectionately termed the 'shredded wheat' (probably an asteroid) which will destroy you, ending the game!
The SECS loader I added later on when contemplating submitting the game to that company, though never did. So the credits in the game should really read IAN, not MARK ;)