Lovecraft theme, Xcom mechanics
A decent Mythos storyline built on top of X-Com UFO Defense mechanics with some CoC character stats. As long as you go through the tutorial to see how everything works, the mechanics are implemented ok (if you have fat fingers, wont want to play on the iPhone).
Relatively short for $4.99, a little replay ability if interested in trying different combat strategies.
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Call of Cthulhu: The Wasted Land