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 $27.8K — a different platform, not this one.

Madshot

Cthulhu heard the call In search of eternal life, you invited forces beyond your understanding. You must invade that abominable eldritch mountain of slushy nastiness known as Cthulhu. Be it your atonement or damnation. You are in Control Doge, roll, dash, wall jump, Backflip, frontflip, hang from ropes, and keep on shooting while doing it. Madshot offers a really fluid and responsive movement where you’re always in control to create intense and cool moments. Slaughter your way to Cthulhu There's a multitude of areas that each offer unique enemies and mechanics. Kill enough enemies to charge a blood portal that summons rewards and a path to the next area and then survive epic and dreadful multi-phased boss battles. Create lethal combinations There's a big focus on synergies between Weapons, sidearms, upgrades, and ultimate abilities that you can combine to make each run unique and fun.