Maybe you could break up the tutorial in mandatory and optional sections too.
If your game's graphical, you might need to brush up on your calculus/linear algebra/mathematics too! good luck on your project
EVE is pretty good, but I probably won't play it after the 14 day trial. It's keeping me occupied until Guild Wars and/or WoW. (probably GW cuz the monthly fee supposed to be free) (Yes I know, Ima cheap-ass