Good idea, needs better execution
I really liked this concept
i guess you can really get higher scores if you make a few changes:
set a higher framerate
set a timer, before starting, so the player isnt threw in the middle of alot of balls without even seeing whats going on
reduce the font soze of the you win/lose, and change the font
add borders to your game, it will be nicer
some music(DONT FORGET A MUTE BUTTON) is cool too
4/5 until now :)