Super polished game!
It looks so clean and beautiful - I like it.
Also work with audio effects is perfect! You nailed it.
The gravity itself a little bit frustrating for me. I found it hard to get ball where I want - they keep falling back.
But still almost every part of the game brings me satisfaction. Box opening, balls pop disappearing when you win. And even the bomb which is an obstacle in the game - feels good.
Nice job!