As you can see when pinch the screen to unzoom it the show a weird black space on the right.

Strange as you cant zoom after entering the maze !!
Think it is more related to device os .

@Haka-Taka as a player it shouldn't matter what phone or os I have... Even if it not bug, it seem to be a strange behavior that is not suppose to happen.

Indeed but this strange behavior come from the os not the game
for example many android devices and ios support split screen mode .but the game doesn't so if the os tried to split it it will cause this issue
it is like ios split screen for me