Good Game
I thought your game was quite entertaining and simplistic and well deserving of a 5.
I did however find one fundamental flaw which I believe needs to be fixed in order for the games challange to even exist. I found that after I had about +14 on the power ups I had just hold down to beat all the children back no matter which power level of child. This needs to be fixed because it made it impossible to lose. Now i went back and tried the same strategy from level 1 to 10 and it worked again. In both instances an occasion child would slip through but it was very rare and normally only once a round or less.
Just thought I should let you know.