For Android 10, it depends on the phone.
I am using Huawei Mate 20.
What I do is:
1 - Close all the the apps from Running on Background
2 - Open Neo Monster
3 - It will be on black screen, wait 15-30s
4 - It will open your browser and AndroidRelublic forum and shows some message
5 - Go to your...
Nevermind. Its working now hahaah. I just forget to give some overlay permissions. And the game just take a bit to load from black screen. Takes 1-2mins