Very Good
The play in this game is quite good. There is an interesting resource management balance between lives, balls, and screen space. For the most part the timer doesn't bring much urgency to the game except in the sense that it effects score. One thing I don't like is the balls respawn if they're crushed completely... It can kind of hurt the strategy aspect of trapping them. Might consider adding some color to liven things up, but it works well enough.