In 1992 home ports were released for the Amiga, Atari ST, Commodore 64, MS-DOS, ZX Spectrum, and Master System.

Space Gun is an arcade rail shooter in which the player views the on-screen action from a first person perspective.

Players use a cabinet-mounted light gun to target and shoot enemy aliens that have invaded a research vessel and abducted its crew.

[2] Several of the home system versions feature light gun support, but all of them allow the player to move a crosshair to target enemies.

[23] Jonnie Cook of Sinclair User described the arcade release as enjoyable to those that already liked the genre, but stated he preferred other games.

Neil West of Amiga Format commented that the title has a high difficulty level and that power-ups are a necessity to continue playing.

[6] The "not perfect" rapid-fire weapon (which needs recharging after prolonged use) contributes to the game's difficulty, as stated by Brian Sharp of Games-X magazine.

[5] Your Sinclair reviewer Jon Pillar and Chris Buffa of GameDaily said that Space Gun contains graphic violence, citing the visual effect of entrails and blood splashed against the screen.

[3] British gaming magazine The One reviewed the arcade version of Space Gun in 1991, heavily noting its similarity to Aliens.

[2] Sega Power magazine reviewed the Master System version, giving the game a score of 70% if the player is using a Light Phaser, but only 50% if a control pad is being used.

[10] Paul Presley of The One for Amiga Games also found that using input devices other than the guns mounted to the arcade machine "just isn't the same".