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Interesting idea, but this game will "die" soon.Why?Read again the advantages user gain when she/he upgrades account...
well Chris actually the ability to add components to ships would make game unique. I don't think there are many games where you can build your own 5 legged tank with 7 MGs and a milkshake carrierthat could work, or not.
OT: Chris why don't you add screenshots section to your game...i think lots of players like preview of game before they register