I got wrecked on my first try, but I got it the second time around XD My strategy was to leave 2 defending on the center, and have one sneak around. It seems to be a 100% win strategy, but I am one point short of a fully nude victory. That is a great incentive to play more aggressively, even when you are sure to win the round, great design. My request would be that it be easier to see who on the opponent's team still has balloons, and a small voice acted sound with each successful hit. Great work :)
Also, if you wanted to continue the game for a commercial release, a tournament campaign would be great, as well as some sort of unlockables. Maybe different swimsuit styles, or cosplay.