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 $78.4K — a different platform, not this one.

Descent 2

Plunge through 30 more levels of Descent 2 as you battle highly intelligent robot enemies, including the evil thief bot, leaving their flaming hulks in your exhaust. Don't keep this feeling of nausea to yourself, go Head-to-Head with 2-player modem support or 8-player network and Tournament Mode. Brace yourself for the world of Descent... if you can handle it. Get them before they get you... Dynamic gameplay that is hard to match even by today’s standards A great musical score composed by artists such as Type O Negative and Skinny Puppy Challenging multiplayer modes