Okey I found the issue and fixed my game!
the OP should check but I’m almost sure is the same problem.
I have seen in the log this:
03-07 13:50:53.095 6484 6501 W System.err: java.lang.ClassNotFoundException: Didn’t find class “com/epicgames/ue4/MediaPlayer14” on path: DexPathList[[zip file “/data/app/com.mukagames.savetheprincess-1.apk”],nativeLibraryDirectories=[/data/app-lib/com.mukagames.savetheprincess-1, /vendor/lib, /system/lib]]
so it is likely MediaPlayer14 has been stripped out.
So, to fix it:
open your proguard-project.txt file (it is located in PROJECT_PATH/Build/Android)
add this lines:
-keep class * extends android.media.MediaPlayer {
public *;
}
Rebuild the project and it should work.