You're Dirty Harry and you need to find and beat up dealers to get drugs and burn them outside the town, which will regain your energy. This is the Silmarils' first game. In 9 screens, you can fight with ninjas, amazons, punks and other thugs and low-lives, and you've only your hands and feets for that !
You start in a street, a punk in front of you, beat him him up and he'll drop his drugs, continue to the stairs to find a guy with a chainsaw, beat him and keep his drugs. Go outside town to burn the drugs in a barrel to regain life and return to the dark side to make the streets safer.