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 $176.7K — a different platform, not this one.

Mana Spark

A challenging action RPG with deep souls-like combat and rogue-like elements. Explore a dreadful dungeon and fight smart enemies that will plan and collaborate between themselves to defeat you. Features: COMPLETELY SKILL-BASED COMBAT : Each enemy has its own set of skills, behaviors and collaborations. Learn their patterns and discover their weakness before they lay their hands on you. EXCITING PROGRESSION : Be responsible for rebuilding and maintaining your guild's village. Meet new characters, choose your traps, your weapons and keep track of your discoveries and unlocked content. HANDCRAFTED & PROCEDURAL GENERATION : Designed to make each new run a completely new experience. Each room is handcrafted to get the most out of the combat, but you'll never explore the same dungeon twice.