1983 Acorn Electron - Acornsoft Arcadians

Acornsoft cassette for the Acorn Electron in used but usable condition
 
Once the game is loaded, the first screen shows the keyboard controls, and asks you to select 1 or 2 to start - select 1 for one player and 2 for two players.
Move the laser-base across the screen to aim at the Arcadians hovering in convoy over you. Fire laser bullets at them while dodging shell-fire as they dive-bomb towards you. Arcadians in the different rows are worth different amounts and, when killed in mid-flight, are worth double their original number of points.
You start with three laser-bases, but can earn another one if you score 7000 points. You have to clear the screen before going on to the next sheet, where a tougher game awaits you!