Space games are a great challenge to play. They are more of fun too. Online space games, especially are designed to keep the player interested. For instance if you take the star trek online game, a player has to manage a whole lot of things apart from destroying the enemy ship. While gaming in space, a satellite may suddenly catch fire or the player may need to go to a planet and get back to the ship to put up the climax fight with the enemy ship.
One needs to have a good practice in handling the graphic buttons so that he/she can be quick and wise in action. Games like EVE online demands one to create an account before they actually start gaming. Space invader games which were the forerunners of the modern video games also host plenty of graphic designed options to shoot and attack enemies which keep the players hooked to the games.