A good balance of winning and losing is important. If you just win all the time, you won't get anything out of it; having some tough losses can be really important. ↗
Do the story in the way it really demands to be done, which may mean using several different styles or only one style; but it's still about respecting the story. ↗
Fear may very well be a caveman fear of the predator, of the giant lizard chasing them - maybe that's what Steven Spielberg connects with so well in Lost World. ↗