It looks awsome, and polished for its style. Can I ask why you went for this poly style rather then realism? I'm all for originality and tired of the same old (new) crap, so *claps for you*.
Cheers. To be honest I've always preferred computer games that look like computer games. I love the flatshaded polygon look and vivid pastel colours etc.. All this realism in game graphics does nothing for me. The added bonus is that due to the simplistic nature of the models, I can retain a consistent look throughout. There is nothing which looks worse than inconsistent media imo.
How will multiplayer work for this game? Will there be a server listings? Lan-only? Direct Connect to host'ee? Or will you host all the servers?
-What do you think about an achievement system? This game looks like the perfect template for one, as achievements seem to be the in-thing these days in games.
Unfortunately, the game will not be online - split screen for up to 4 players only. I have no networking experience and working with physics online looks like it'd be pretty tricky. The idea is that you play single player missions to unlock new mini-games, new vehicles and levels.