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 $99.2K — a different platform, not this one.

Kero Blaster

Studio Pixel is proud to present Kero Blaster - the latest title from the creator of Cave Story. The C&F Inc. teleporters are going offline all over the place, and it's up to an intrepid frog employee to fix the situation. A classic-style, 2D side-scrolling action game packed with adventure. You are a bipedal frog and master of the Custodial Sciences, charged with the unenviable task of ridding your company's teleporters of the strange black creatures plaguing them. Pick up all kinds of exciting new tools of the trade while fighting for your life through a menagerie of unique monsters.