Confusing
I gave this game 7 and not 10 for two reasons: the instructions are confusing and go by too fast, and it takes a bit too much effort to upgrade to the point where the game is playable.
The objective is something like this: click when the business man gets to the center of the colored bar at the top of the screen. The closer you are to the center, the more time you have in part 2. He then gets tossed in the air, where you hit him and fill up the power meter. Take your time and kick around his briefcase. This will be difficult at first, but gets easier as you upgrade. Finally, you get your "finishing kick". Click when the bouncing arrow gets to the center of the meter for max power.
Now, the harder you hit the man, the longer he stays airborne, and the more upgrade points you get. You can use the power blast or the kick to keep him airborne. Both of these deplete your power meter by a set amount. As the man flies, ninjas will come on screen from the right and try to knock him down. Click them to recharge your power meter. Be careful, as this uses your kick, and it will be unavailable until it recharges.
It will take a while until the game is easy enough to score major points. Upgrade Accuracy whenever you can, upgrade the flying kick, and the air punches. The more time you have in the air and the more power you can build up, the longer you can keep the guy in the air.
This is a fun game, but it takes some work to get to the point where it's fun. I would have given a higher score if the instructions at the beginning were clearer.