When you get right down to it, Warhammer Quest is a fairly straightforward action-RPG that's set in a generic fantasy world. This is actually good news though, because despite taking place in the Warhammer Fantasy universe, familiarity with that setting - which many potential players, myself included, completely lack - isn't necessary to enjoy it. The better news is that you will enjoy it, because while it may not be particularly revolutionary, it is extremely well-refined.
If you're into fantasy, it's nearly guaranteed that you've run into the Warhammer universe at some point or another. The highly-regarded fantasy setting has permeated through tabletop and electronics games of several forms as far back as the 1980s. But along those years, there's one place Warhammer has yet to extend its reach: mobile devices. Until now.