I know the definition of high fantasy and low fantasy, and can recognise it when I see it; but in terms of game mechanics what brings out high fantasy in a story game? I'm particularly fond of Danger Patrol Pocket Edition, which is a pulp (low fantasy) game, based on its colour text (unless I've misunderstood it). But could it be used for the basis of a high fantasy or even epic fantasy? Is there something about the game mechanics there that prevent it.
Seemingly D&D trends towards low fantasy and I can recognise some of the features that make that so, but what features propel a game towards high fantasy or even epic fantasy?