Maximize your touch targets
The elements in your scene may appear to be small and separate from each other, but their touch targets should be as large as possible. Elements in rows should be as tall as the row itself and extend (when adjacent) to the very edge of the scene.
Ensure that the touchable elements in your scene are as large as possible. Touch targets in rows should be as tall as the row itself, and should butt up against each other, such that there's no dead-space in between them.
.