If he takes up with his wing lady, she will fight like a banshee, but his female mechanic will not fix his plane very well and it will be prone to mechanical failure. If he takes up with neather one, they both will play kind of average not giving extra help or hinderance. You can see that a branching plot line can have many interesting choices. Do they use wire frames, polygons, etc. For example in Myth one of the predominant features is that blood spurts and permanently stains the battlefield red.
Heads come off and roll down hills and away from bodies.
When bombs go off, body parts, including arms, legs, and torsos, fly in all directions accompanied by gore. Body parts lay on the battle field for a long while after each skirmish. Do lights glow and cause shadows. Are there sprites which move around the screen and if there are are they three or two dimensional sprites. Humor is very important in games.