The ball gets stuck bounding perfectly vertical for long periods of time. Suggest adding more randomness to the system to keep things moving. Perhaps making splits possible on collisions with the paddle as well?
Might I suggest tooltips over the information in the top left box (click DMG, Gold Bonus, etc) that tells you precisely who and/or what is contributing to those statistics?
Suggestion: In the panel that shows loot data for the current region, add two additional statistics.
1) winning percentage against normal mobs.
2) winning percentage against region bosses.
Knowing both of these will help us determine where we should be idling!
That's a great Idea if I ever saw one! Has been added with Version 2.8!