Star Commander is a competitive game where players are attempting to dominate a region of space. The objective of the game is to build the most developments in their systems before the game ends. You can do this by building a strong defensive position, or by being aggressive and preventing your opponents from establishing their own empires.
The game ends when a player's homeworld has been conquered, or when one of the Domain decks no longer has any cards in it.
At the end of the game, whichever player has the most developments wins!