I think Hangman would be a very boring and unorginal name. I do not want to buy a game with the name Hangman. It just does not sound very atractive. I would try a more out standing name, for example a more fancyer version of the word Hangman.
Oh, and I love the looks of your game.Keep on working!
Some games play very well on the iPhone, but do not translate into a popular game on the desktop. I can see hangman being a popular game on the iOS, but its not something that would be a major draw for many people for OSX.
Looks great and I'm not trying to slam the OP or his work, just stating that an iOS app's success does not translate into OSX success.