It'd have much less buttons to assign and flashier graphics (which we have anyway, thanks to FSO...), no modability and arcade-y flight model that doesn't even pretend to have anything to do with reality. Probably one, upgradeable ship with fixed weapons and an absurd number of missiles and unlimited gun ammo. Dinky capships with a gimmicky way of fighting them. 2D art would've been much cheaper and VA would've been amateur. All cutscenes done in-engine, and no mainhall (main menu used instead). It'd most likely be a low budget game, indie or otherwise. Oh, and it'd be completely obscure. Think Sol: Exodus or Project Freedom (aka. Starmageddon 2). You most likely didn't hear of the latter, and for a good reason. It's a medicore game from a Polish developer (IIRC).