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 $236.5K — a different platform, not this one.

Zombie Shooter 2

Imagine yourself coming to visit an unknown city and seeing it almost ruined, with all the citizens turned into zombies. What will you do? Call for help, organize a large-scale rescue campaign or... Try to dig your way out of the situation, find out what happened and use your last chance to save the person you love! Zombie Shooter 2 is a unique blend of two game genres - Action and RPG. Every player can choose a character to their liking, get experience to develop skills, earn money and spend it on weapons, medications, and useful devices. All of this will be used against thousands of enemies. The zombies fill the game screen, never letting you rest, even for a minute. From the maker of the legendary Alien Shooter series. Huge crowds of enemies, more than 100 zombies on one map at a time. Several types of vehicles to drive. Ability to upgrade the main character's parameters. More than 60 weapon types, including sniper rifles. Lots of auxiliary devices, including radar and battle drones. Three game types: Campaign, Survive, Gun Stand.