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 $6.5K — a different platform, not this one.

ROGUE-FP

ROGUE-FP is a blend of old school classic roguelike gameplay with new school first person controls and perspective. There is no movement grid and no rigid turn system to slow you down. Synopsis The Fighters guild has a high bar for entry. They want you to delve deep into the Dungeons of Doom and return to the surface with the Amulet of Yendor! A perilous quest few have completed, for within the dungeon are terrible monsters, devious traps, and mystifying magical items. To survive you'll have to identify the dungeon's items, navigate it's procedurally generated dark labyrinths, and fight your way past it's monsters. With enough skill and a decent amount of luck they say it can be done. Give it your best shot! Features Just like in the roguelike days of yore, there are Procedurally generated levels! Perma-death! More than an alphabet's worth of monsters! Many magic items with different effects including rings, weapons, potions, scrolls, and wands! Yummy slime molds to eat! But in ROGUE-FP there’s also Hacked off bits of monsters to stick onto your armor Your personal gold pile that grows larger with every run ASCII art sprites First person controls A innovative smooth turn system No grid to restrict your movement Dungeonsynth soundtrack Difficulty level for every level of skill, including one that removes item identification