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 $25.7K — a different platform, not this one.

Vertical Drop Heroes HD

Vertical Drop Heroes is a procedural platformer RPG hybrid with roguelike elements, where your hero adventures through randomly generated stages. Armed with a variety of skills and traits, you must use your cunning and reflexes to survive the dangers of each stage, until you face the final boss and uncover the truth behind the game! Vertical Drop Heroes features randomly generated stages, enemies, and bosses, resulting in a very replayable game, all coded and drawn by one person in that unique Nerdook style. Bring a friend and try the split-screen local co-op or play multiplayer games over a network. Controller support: Vertical Drop Heroes HD fully supports the Xbox 360 controller. Multiplayer notice: The multiplayer mode is only available for the PC version at this time. EXTRA: An interview with Nerdook, the game's creator, on the GOG.com Blog ! Randomly generated worlds on each playthrough, with different enemies, heroes, skills and special level events. Unlock more traits, upgrades and skills for your Heroes as you play, and unleash them on your unsuspecting enemies, growing stronger with each playthrough! Play with a friend in split scren co-op mode, or play multiplayer over a local network! Two Heroes means twice the mayhem! Enjoy GOG exclusive in-game content!