I heard Civilization V has touch, I haven't played it personally.
In the Store, GTA: San Andreas, Halo: Spartan Assault, Modern Combat 5, Asphalt 8 are fine games.
Hearthstone works fine on touchscreens, needs internet though as its a multiplayer game.
Starcraft is possible, although somewhat awkward.
There's this thing, I forgot the name, but its some program that overlays appropriate touch controls over games like Half Life 2.