Sega Master System / Mark III / Game Gear
Sega8bit & SMS Power! 2013 Event - 10th August 11 weeks and 6 days from now
From a crippled spaceship at the edge of the galaxy comes a cry for help. Alien monsters have taken over, and it's up to you to save what human crew remains! Choose your own path down dark corridors and through deadly arenas in non-stop shooting action!
There is a development page for Space Gun. Visit it to see technical discussion of this game.