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 $445.8K — a different platform, not this one.

Tower of Guns

Tower of Guns is a fast-paced randomized FPS for the twitch gamer, a short burst "Lunch Break FPS" not unlike FTL or Binding of Isaac mixed with Doom 2. If you're gonna win, you're gonna do it within an hour. That's a big if though... it won't be easy. With random enemies, random power ups, random bosses, tons of unlockable items and weapons...and even random-level composition - you never know what to expect! So grab a rocket-launcher, slap a shotgun-modifier on it, pick up a hundred stackable 'double jumps' (or centuple jumps at that point, I suppose) and get to conquering the Tower of Guns! Tower of Guns was made by a guy named Joe (with his brother Mike composing the music). A gratuitous amount of bullets and projectiles! Randomized levels, enemies, loot, and mobs makes for a highly replayable experience. ”Lunch-Break” style play sessions: the perfect game for the gamer with not a lot of time.