Your app may crash when used on Android devices running Android lollipop such as the app simply exiting itself, or it getting stuck on a black screen. There could be many reasons as to why this is happening, but it is worth investigating any older libraries you may be using in your app as they may not be compatible with Android API level 22. A good way to test this would be to disable libraries one at a time until the app runs; once it does, it’s worth investigating the last disabled library further.
As always, check out the app's logcat for more information which should be able to help you debug the issue. Also, don't forget to always check for library compatibility on higher versions of Android.
Keywords: bugs, issues, gameplay, api 22, lollipop, crash, exit