I didn’t know to pull back the cue with the power meter on the left of the screen. I spent a few minutes trying to drag the pointer backwards to pull back the cue and I couldn’t work out how to take a shot.
Some +/- fine tuning buttons to make small changes to the aim would be useful, because these would enable me to aim without dragging. Whenever my finger left the screen it would slightly move the cue and spoil my shot.