There are many scam apps on playstore and also scam extensions on chrome store. Sorry for being a victim and thanks for reporting this. If the developer of the app can be fetched out by Google, this will be great. Wish you the best in getting your funds back.
Now, I think I will always take all normal precautions before using any wallet app on playstore.
Like checking reviews of other users
Checking the developer info
Checking related apps and so on.
I would also add: never deal with your cryptos while you are tired! Because that's what happened: I didn't sleep the night before, I was really tired and my brain was working at 10% -> shit happened