If you were searching on something to fit into the column of top revenue generators of the current financial year then look into the list of online space games for there are a number of one’s which have made it above the par line. The space invader games are in a hunt and those designers and the marketing staff out there would be resting in Hawaii with it being a great success.
I really wonder how these games were so successful. Space games have the thrill built in them and the games are designed to be as challenging as possible so as to pull a number of people towards the game. Fighting is always fun especially if it is a game. So go on and have a great time destroying all those enemy warships. Beware they might put up a shield, but as far as the game is concerned you are the best. So go on and break them.