I enjoyed it!
While I found it difficult to a degree, I know some people found it to be very easy (I don't know how they do it!). I thought it was pretty fun and I enjoyed that your lives go up as the amount of bouncy balls increase. The only thing I would say to improve it is add some color. While the actual action of the game was enough to keep me playing I feel like some added colors might give your game some more appeal. It was interesting to play but not so interesting to look at.
Overall, I had fun, well made, nothing glitched on me, so good job!