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 $10.8K — a different platform, not this one.

Twin Cobra

“FIRST STRIKE… WITH TWIN COBRA!" Twin Cobra (known as "Kyukyoku Tiger" in Japan) reaches new heights on PC with updated extras and quality-of-life bonuses like quick saves, online leaderboards, arcade-accurate emulation, and a brand-new beginner mode. In this vertical shmup classic, you'll have your hands full with fast-flying action and deadly opponents swarming the sea, land, and skies! You're an elite chopper jockey ready to destroy an evil superpower! Their reign of terror stretches from coast to coast. But your might and will to fight are far greater. Take aim and make their ground grunts groan, their heli-fellas faint, and sea swabs sink! ORIGINAL GAME FEATURES: Drop devastating bombs and fire four ammo types from the world’s fastest attack chopper! Bypass hostile battleships and soar through enemy strongholds. Your opponents retaliate on every front using aircraft, aircraft, and tanks! Fly solo or join forces with another Cobra jockey in co-op mode! Survive longer to grow even stronger! Evade incoming shots to increase your fire rate and damage. Original soundtrack by Masahiro Yuge and Tatsuya Uemura 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. Capture sharable replays to immortalize your air strikes (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. Hone your skills in the ultra customizable practice mode!