Sometimes it’s better to put your phone on the table and play that way. It gives you the much needed stability.
Try playing with different fingers. Sometimes your thumb does a lot better job than your index finger,
You could also try changing the perspective, turning the phone around playing upside down. It doesn’t affect the game’s physics, but it offers you a new way of looking at things.
Ignore the global high scores because they are unreal and probably fake. Take your time and try to beat your own score.
Keep in mind that the score of 10 points isn’t half as bad as you might think. You also get a medal, which says a lot.
Since this game is mostly about subconscious mechanics, let your hand do the work and try to relax.