No revenue estimate for GOG — its rating/review counts don't calibrate to sales the way Steam's do. The Steam version is estimated at $37.9K — a different platform, not this one.

Only Lead Can Stop Them

In “Only Lead Can Stop Them” you take on the role as a soldier during the Spanish Civil war, fighting to defend the republic from being crushed by opposing fascist forces. Over the span of your adventure, you will explore three epic campaigns with a total of 30 levels packed full of dangers and secrets to be discovered. Explore ancient castles, catacombs, muddy trenches, dense forests and combat zones of a war torn battlefield, whilst earning medals along the way for your heroic deeds! Blast your way through fast-paced levels using your powerful arsenal of ten weapons, including machine guns, explosives, shotguns, pistols and rifles. Fight with purpose! Free your fellow comrades and unravel the fascists' path of destruction.     Only Lead Can Stop Them” takes stylistic influence from classic 90s shooters , featuring detailed environments and enemies rendered in pixel art as well as an uncompromising, break neck, fast paced style of gameplay.     The game features over a dozen distinct enemy types to fight. Whilst many of your enemies will be equipped with firearms, you will also battle strange supernatural occult forces capable of blasting you to pieces!