Originally, I said this game was too difficult. However, the developer responded extremely quickly and has updated the tutorial to be very clear & easy to understand within 24 hours of my original comment. Turns out what I was doing wrong was I wasn't using the small white dot to predict the ball's trajectory, once I read about it in the updated guide, the game became second nature.
The game itself is fun! You get used to it pretty quickly. Very cute style and now that I understand it - it's definitely worth $6.