I think it was a ZX Spectrum port... the one I played was in spanish if I am not mistaken...
in the game, you could only move right. You started with a spaceship, then if it was destroyed you could use a kind of jeep, then if it was destroyed you could run on foot with your caracther.
but you COULD NOT stay put in the same place, because from the left, came THE DARKNESS... it would move steadily to the right, and you needed to escape it.
