Masterspace is a game about mining, creating and exploring, featuring fully destructible smooth terrain and spaceships that allow you to travel between different planets.
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StarMade Alternatives
StarMade is described as 'Minecraft inspired 3D space shooter' and is a exploration game in the games category. There are more than 10 games similar to StarMade for a variety of platforms, including Windows, Steam, Android Tablet, iPad and Linux apps. The best StarMade alternative is Archean. It's not free, so if you're looking for a free alternative, you could try Space Agency or Dyvox Pytheas. Other StarMade like games are Space Engineers, ScrumbleShip, Space Agency 2138 and Avorion.