1. There should be a way to collect energy levels 2. Very difficult to get rare items 3. Most of the higher version of items can't be get easily.it wil take lot of time. Till then the game becomes very boring 4. No option to log out from account 5. When the update is scheduled and game is opened, it will ask to download update from Play Store. However there won't be any update in play store. This happens every time and very annoying. After there won't be any reward.