Really good job on this one :D
I really enjoy the artstyle, it's very simple but it does the job! Same goes for the sound design and gameplay, its simple but fun.
Only thing I'd like to see is some sort of tutorial / intro (perhaps I missed that?). It took me some while to figure out why I couldn't pop some of the balls and how I could switch between the needles. Nevertheless, cool game (I got a highscore of 25 by the way ;) )