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 $9.7M — a different platform, not this one.

Metal: Hellsinger

Every legend has a song. And yours is one of metal, vengeance, and destruction.    Part human, part demon, and bent on vengeance. Become The Unknown, and fight through the fiercest domains of Hell on an infernal ride to face the Red Judge herself. You have a score to settle.    Slay to the beat   Metal: Hellsinger is a rhythm FPS, where your ability to shoot on the beat will enhance your gameplay experience. The more in sync you are with the rhythm, the more intense the music will become and the more destruction you will cause.  Demonic arsenal   Defeat the demon hordes with your skull-clad blade or range of murderous weaponry. Once your ultimate is ready, unleash havoc with the weapon ability of your choice.  Horde mode   Enter the Leviathan game mode, where you must defeat increasingly challenging waves of demons in hellish arenas. As you progress, make brutal decisions about what upgrades to choose, and forge yourself into a true headbanging machine of death.    Multi-award-winning original soundtrack   Every track has been created specifically for the game by composer duo Two Feathers, with vocals by metal icons such as Serj Tankian (System of a Down), Randy Blythe (Lamb of God), Alissa White-Gluz (Arch Enemy), and many more!  Epic story   Play through an epic storyline, narrated by award-winning actor Troy Baker. Unlock special challenges and conquer the realms of Torment to become more powerful.  Fight through fire, ice, metal and madness   Although commonly known as Hell, The Infernal Planes is in reality a union of a thousand Hells, all of which are terrifying and diabolical in their own way. In order to dethrone The Red Judge, you must fight your way through the fiercest corners, from the icy world of Voke to the maddening world of Stygia.  From the Lead Designer of Battlefield: Bad Company 2   Metal: Hellsinger is created by an experienced FPS team at The Outsiders and is the passion project of David Goldfarb, Game Director on Payday 2 and Lead Designer on Battlefield 3 and Battlefield: Bad Company 2.    DMCA and Copyright Information:   We fully own the songs as they are specifically written, produced and performed for the game. For content creators, we have done everything from our side to make sure strikes won't happen. PLEASE NOTE: The GOG version of the game does not include leaderboards.