Its available on Playstore
The name of the game is Guns Of Boom.
For Android Download from below
https://play.google.com/store/apps/details?id=com.gameinsight.gobandroid&hl=en_GB&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dguns+of+boom+android

For IOS ..follow below link
https://itunes.apple.com/us/app/guns-of-boom/id1179715015?mt=8