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 $190K — a different platform, not this one.

Indoorlands

Welcome to your own indoor amusement park Build your own indoor amusement park, manage it and convince your visitors with individually designed halls, coasters and rides that you even can control yourself. Will you manage to exceed the needs of your visitors? You are the boss: Let your creativity run free and run your own customized park that fully immerse your guests into another world. You always wanted to create your very own and unique ride and then control it? That's now possible with the new "Create your Ride" mode. Choose from a variety of components and create your very own flatride. Then share your creation with other players around the world in our workshop. With the latest update you can even create your own, huge rollercoaster halls with individual coaster tracks. Build your dream amusement park Build, expand, and manage your own park. Take up the challenge and progressively unlock different types of halls, rides, decorations, shops and visitor types. Level up your buildings, choose individual perks and adjust price/quality, so your guests are ultimatively satisfied. You can choose from a variety of themes and combine them freely - there are no limits to your creativity. Design your park piece by piece: Indoorlands makes a designer out of you with over 1000 decoration objects! Control and ride unique flatrides Your rides are the center of attention at Indoorlands. Not only can you control them and paint them individually, you can also record and save your own ride programs. Choose from your different ride programs and let them play automatically. Turn your dreams into reality Show the world your vision of a perfect indoor park. Indoorlands offers every player the opportunity to create a unique park. Place and decorate your ride halls and decoration halls. Design your rides and create breathtaking ride programs. Choose from an overwhelming number of different stores and restaurants, make your visitors happy and become the most successful park entrepreneur. Whether you want to recreate your favorite parkrides or leave the real world at the door when designing your rides and roller coasters... - the decision is up to you!