You are the last robot of its kind, defending the planet against mighty alien forces. In Skyrift, the only way to defend yourself is by deflecting projectiles back at attacking spaceships.
Your goal is to destroy as many spaceships as possible. The longer you sustain, the more spaceships will attack, which will increase the difficulty rapidly.
With every destroyed spaceship your score will increase. Every score is stored in a leaderboard on this website where you can fight for your reputation as a worthy defender.