Nice game! Really like the idea! Love the sound and graphics of destroying the balls
1 suggestion I have is to add a health bar or maybe a score system, just because it is a hard game and it would be nice to progress even if you miss 1 or 2 balls
There is a score system. In each level you have to make a specific number of points (or more) and even if you miss a few balls you still should be able to get to the next level.