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 $35.3K — a different platform, not this one.

Secret Agent HD

The greatest Secret Agent on the planet is back! Revisit the 3 original episodes in spectacular HD and guide Agent 006 to recover the Red Rock Rover project blueprints from the Diabolical Villain Society (DVS). Then help Agent 006 explore a hidden island in the brand new episode and uncover DVS's secret lair! Enjoy competing against all the Secret Agent fans on the new online leaderboards and collect a wide range of achievements along the way. Features: Help 006 recover the Red Rock Rover blueprints by guiding him through all 3 original episodes in HD!   Uncover 16 Exciting new missions in the all new Secret Agent Episode 4, with challenging puzzles, action oriented hazards and rewards that will have you aiming for a spot on the top of the leaderboard!   7 New Enemies, 2 New Powerups, Breakable Blocks, Secret Level, and More!   Be the first to earn all of the achievements including discovering the "Island Secret"!   New Difficulty levels of gameplay, Cloud Saves!   New OST in the Classic Adlib style to tickle your nostalgic funny bone!