Castlevania was reinvented in recent years, likely to many gamers' chagrin. The franchise, at least for this time period, became Castlevania: Lords of Shadows. Like its console brethren, handheld Castlevania titles also became part of the Lords of Shadows series during this time, resulting in the development of Castlevania: Lords of Shadow - Mirror of Fate. This title, while released after the initial Lords of Shadow, is a prequel that both covers some back-story for the first game and sets up the event of Lords of Shadow 2 -- the conclusion of the series.
In Castlevania: Lords of Shadow - Mirror of Fate, the player takes on the role of Trevor Belmont and his son Simon Belmont, as well as Alucard. Simon, believing his parents were slaughtered by Dracula, goes to Dracula's castle to avenge his family. The truth of his family's fate, as well as the mysteries of the castle, will throw both Simon and the player for a loop they're likely to already know from previous Castlevania games.
In terms of gameplay, Mirror of Fate is less of an evolution on the Castlevania format so much as a toning back of the excess the franchise has embraced in recent years. The visual style, with its 2D pixel sprites, was discarded in favor of new 3D assets which added depth to the setting. Much of the RPG mechanics in the game were also discarded, toned down to refocus on basic 2D platforming and action with only a few of the iconic weapons the franchise is known for.
Altogether, Castlevania: Lords of Shadow - Mirror of Fate is a more cinematic approach to the Castlevania franchise. In itself, it's a very good game, but due to its association with the two other console titles and it being the middle child of the series, it doesn't get as much attention as it likely deserves.