ну вот к примеру:

23. (Controls) A portrait view works great on a phone when the player must click or swipe. But it works poorly on tablets.
That is because for tapping and swiping all over the screen, you need to hold the device in one hand.

24. (Controls) Don't force the player to hold a tablet in portrait mode with two hands at the bottom. It is tiring for the hands.
Try it for an hour!

25. (Controls) Scrolling manually around on a small screen is cumbersome. So preferably avoid scrolling or do it automatically.
The problem is that you do not really have a control mechanism for this. Normally tapping with fingers on the screen will influence the game. And when you use virtual buttons for the game, the player does not want to move his fingers away from them.

тыц