It's just the normal system warning! Any unknown file will generate this message!
My game is on version V0.57 and, so far, I haven't received any reports of phones exploding after downloading my game! he he he
Viewing post in Public Update | Tacarasu V0.57 | Windows and Android comments
Got it, thanks. I dont know if this will help but if it can make the message go away I am sure more people will download. Here is some information from Google https://developers.google.com/android/play-protect/warning-dev-guidance