Earthlight

Earthlight is a scrolling shooter published for the ZX Spectrum in 1988 by Firebird Software. Written by Pete Cooke, it follows Slaatn, an alien explorer from the star system of Arcturus who is drawn off-course by a beam of energy from Earth and forced to land on the Moon.

To escape, Slaatn must neutralise box-like transmitters and eliminate the force field. The game is notable for its parallax scrolling and shadow effects, presented as distinctive technical features on the Spectrum.