Pocket Gems, one of the top developers of games for the Apple iTunes App Store, is releasing its first game developed from the ground-up exclusively for Android.

Tap Dragon Park debuts today in the Google Play store. In the game, you train dragons to protect villages from evil trolls. You use the elements to fight the trolls and expand you kingdom.

San Francisco-based Pocket Gems has become a leader on iOS since it was founded in 2009. The company now has more than 110 employees and has had 60 million downloads for games such as Tap Zoo.

Dragons are popular in mobile games now, and Tap Dragon Park will compete against successful titles such as DragonVale from Backflip Studios. Pocket Gems has raised $5 million from Sequoia Capital.

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