Pretty fun
Suggestions:
1. More skins.
2. Instead of all grey and blue balls, you could make them different colors with the same code to add / subtract the total
3. A color changer could go along with #2 to change the ball color if the player wanted
Response from developer
Thanks for the feedback. 1) The ball going faster than you finger is intended to prevent finger fatigue. 2) & 3) Will definitely consider the enhancements in the next release.