Got my nova 2 days ago it's a great pad lovely to hold sticks and gyro are butter smooth also low latency inputs low ms so all food buttons are almost mechanical clicky and fel amazing
Make sure you don't have any other apps which use the floating widget permission...I had a screen clicker app installed which stopped Mantis from working/recognising input so I uninstalled it and Mantis worked fine (you can just disable them too). You can check in your Accessibility options (on a Samsung that's in Settings - Accessibility - Installed apps). Just make sure everything else is turned off in there.
It should work with GTA OK but for PUBG you'll need to map the controls with something like Mantis: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-TSaZSHoXsfw.html
