The gray spherical objects are bubbles that you can pop with a finger press. Don't be too quick to get rid of all of them though, as they can be useful for protecting your growing circles from dangerous objects. Only ever clear just enough space to allow growth to continue before popping any more.
Star Citizen is an upcoming space trading and combat simulator video game for Microsoft Windows. Star Citizen will consist of two main components: first person space combat and trading in a massively multiplayer persistent universe and customizable private servers (known as Star Citizen), and a branching single-player game (known as Squadron 42). The game will also feature VR support.
