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 $7.9K — a different platform, not this one.

Flying Shark

Toaplan Arcade Shoot'em Ups 2 bundle "AIM RIGHT. FLY TIGHT. THE SKIES ARE NOT FRIENDLY TONIGHT." The enhanced edition of Toaplan's 1987 vertical shooter Flying Shark (AKA Sky Shark) includes online leaderboards, a beginner mode, CRT filters, and much more! Despite its simplicity, Flying Shark requires strategy and guts thanks to an innovative feature: OFF-SCREEN ACTION! By flying left and right, you can expand your field of vision beyond the screen borders and reveal hidden threats! "We are at war's end, and the enemy has taken control of most of our military bases. Only one man can restore our flagging fortunes and bring us back to glory... The legendary FLYING SHARK!" ORIGINAL GAME FEATURES: Chase enemies off-screen to dominate the battlefield! The enemies are sneaky, so use your limited supply of bombs wisely... Upgrade your plane with destructive power-ups scattered throughout the stages. Compete with a friend to see who's the best! Enjoy the striking visuals and highly detailed settings in this timeless masterpiece. QUALITY OF LIFE IMPROVEMENTS: Minimal Input Lag: Emulation, input processing, and rendering all complete on the same frame. Quick Save using F1-F10, Reload with Shift+ F1-F10 Online leaderboards for Single Credit, No Assist, and Assisted plays. Instrument panels with extra gameplay information and artwork. Rewind the game between 10-18 minutes, depending on the action. Experience the game in Mirror Mode Capture sharable replays to immortalize your interstellar victories (or funny moments). Assist Features such as auto-fire at multiple rates. Very Easy Mode: Lower the difficulty to breeze through the adventure. Pixel perfect or full-screen scaling in windowed or full-screen mode. Rotate the gameplay in 90-degree increments. Achievements Hone your skills in the ultra-customizable practice mode!