Tentacle Wars HD is an enjoyable action strategy game, with appealing graphics, sound and gameplay - but it's short on levels.
Few recent tactical strategy games have received such a large amount of attention as Frozen Synapse [$6.99 (HD)]. It has been praised for both its art style and excellent strategy gameplay. Starting on PC and Mac it has now found it...
Tiny War Online has a lot going for it. Solid gameplay, decent graphics and tons of strategies that keep it interesting. Here are more apps you might like: Roman Backgammon - Old World Board Game for iOS
Legendary Wars HD is an iPad version of the castle defense/real-time strategy hybrid from Liv Games. [ Legendary Wars HD Review is a post from 148Apps ]