Indie studio Game Swing and Ghost Ship Publishing have released the four-player co-op shooter–roguelike “Guntouchables” on Steam. The game became available today, 7 August, and can be added to users’ libraries at no cost during the first 24 hours on the platform. The promotion expires on 8 August at 10:00 a.m. CEST, after which the title will retail for US$5. Players who claim the game within the window keep it permanently. Guntouchables features mission-based runs for up to four players who defend a doomsday bunker against evolving mutant hordes, choosing character-specific perks and enemy mutations between rounds.