25 wasn't difficult at all. If you play with it a little bit you can get the ball to bounce back and forth between the two vertical bars and one of the horizontal ones, without having to move the mouse at all!
Fun game, but got pretty easy as it went on. Several levels in the middle I wasn't hit once until I reached the boss and often could sit in one position and collect the points.
Final score= 353,420,494
 "me and the key"){kind=icon}
 "Frantic"){kind=icon}
 "99 Bricks"){kind=icon}
 "Factory Balls 2"){kind=icon}
 "Ether War"){kind=icon}
 "The Egg"){kind=icon}