My own Android word puzzle

Hello there, I've just created an Android guessing game, Hangman. Let me know what you think.

Google Play: https://play.google.com/store/apps/details?id=com.cloversoftware.hangman

Description
Stop wasting paper! Now you can play a popular word puzzle game on your Android device for free. Guess the hidden word by selecting letters. Each incorrect letter is one element of the hangman.
Hangman offers a host of exciting features, including:
•   Fun categories: Geography, Food, Art, History, Science, Animals and Sport
•   Hangman supports one player and two players gameplay
•   More than 1200 words in the dictionary
•   Hangman game for free

Screenshots

Google Play: https://play.google.com/store/apps/details?id=com.cloversoftware.hangman