I tried to play it on iPhone at first, but I cannot see the obstacles (see screenshot.)
I did play it on Desktop as well, and the game has a lot of juice. Nice particle effects, sound effects and animations. The style is clean and coherent. The game is good at building tension.
It took a while before I understood I could touch and drag the ball again to send it in a different direction only after I collected a crystal. Once I knew that, I was able to score some more points. Good work on the entry!