Earlier quoted context omitted.
Why are you purposely trying to prevent non-mobile users from using your app? Do you think that will prevent cheating?
You can't really assume that mobile devices can't cheat though - you could (rather) trivially inject cheating javascript into a WebView.
I see that you actually took the liberty of proving your point looking at the leaderboard.
We will try to fix these issues as soon as possible. - Sagar, VsMe Gaming