Day 24
Did it! The game is finally available on the Goole Play Store with screenshots and a short video: https://play.google.com/store/apps/details?id=org.godotengine.protectat
Things to keep in mind for next time: Give the project a unique name from the beginning. Now I'm stuck with "org.godotengine.protectat" forever as it seems. ;) Not a huge issue but com.pixelflausen.protectat would have been nicer.
Another thing I need to pay attention to is srceen resolution. Obviously not all mobile phone come with the same as mine so the add on top might overlay the score and time. It fit's perfectly on my phone but today I had the brilliant idea to use the Android Emulator and well, it didn't look good. So the ad got moved to the bottom where is doesn't overlay anything. An update which still needs to be approved...