If you like Sci-fi stuff, buy this game.
If you want to conquer the galaxy, buy this game.
If you want to build a space fleet, buy this game.
If you want to be an evil emperor, buy this game and destroy the galaxy.
If you hate humanity, buy this game and slaughter them.
If you love humanity, buy this game and save them from the evil aliens.
If you don't have any friends, buy this game and spend all your time on it.
If you have many friends, buy this game and play with them.
If you don't know what to buy on the steam sales, buy this game.
If you don't know what to buy after the steam sales, buy this game.