You can download for PC through several official digital storefronts.

Gun Crazy is a fast paced and hectic arcade style action shoot em' up sporting old school pixel art and a retro sound track. Go to product viewer dialog for this item. Gun Crazy - PC Game - Steam Key | Fanatical

Gun Crazy is a fast paced and hectic arcade style action shoot em' up sporting old school pixel art and a retro sound track.