Panda is constantly starving and loosing health: The goal of the game, is of course to kill all Humans on each level before your life runs out.
You can walk around by moving the mouse or pressing the arrow keys, and attack by clicking or pressing space. Hold mouse/space button longer to perform different types of attacks.
From time to time, you may want to relieve yourself, for extra health gain. To do so, eat enough to be at least half full, then stand still for a few moments.To refill your health just keep eating plenty of greens and proteins, but try to avoid food thats bad for you!
As a bonus you can perform Fatalities on all enemies, just keep pushing them for a few seconds.
The Game has 11 Levels, so keep at it, later levels introduce more variety and more puzzle based killings where you have to eat people in a strategic order:)