Game doesn't resume after using back arrow key

Expected behavior

I expect the game to resume back when the back arrow keys are used

Actual behavior

When I used the back arrow key when playing a game, the game doesn't resume back to where it was I.e game doesn't continue from where it was

How to reproduce

• Download Taponium form fdroid here

• Start a game, play for a few seconds, use the back arrow keys on your mobile device, game doesn't resume from where it was, it starts a new game automatically

• Browser: Taponium version 1.0.7
• Operating system: Android 7.0

Recording Of The Bug