There are two ways to complete this game. One is to write on old man sign and other is not to write. If you write on the sign old man will be beaten and you can kill the bold one, if not bold one will change his ways, and you can't kill him....
You can win so easy without taking any hits!! Buy hunter and place him at the lower left corner and then upgrade to the elite archer. When you upgrade him to max, you just need to upgrade his attack rate...
i lvl 20 just run to green thing and jump, when you start to fall press space and do the same thing again... At the end you will jump off the other heads and reach the other side.
 "Bubble FruitTail"){kind=icon}
 "Penguin Overlords"){kind=icon}
 "Jacob and the Gyrocopter"){kind=icon}
 "Blow Things Up!"){kind=icon}
 "Space Attack"){kind=icon}
 "Reincarnation: Let The Evil Times Roll"){kind=icon}
 "Monkey Lander"){kind=icon}
 "Epic War 4"){kind=icon}
 "Battle for Alandria"){kind=icon}
 "Duck, think outside the flock"){kind=icon}
 "Dynamic Systems"){kind=icon}
 "Tilt"){kind=icon}
 "Huje Tower"){kind=icon}
 "Ball Revamped 5: Synergy"){kind=icon}
 "Grid16"){kind=icon}
 "Frontline Defense Beta 2"){kind=icon}
 "The Company of Myself"){kind=icon}
 "Take Something Literally"){kind=icon}
 "Swords & Sandals III:Multiplae Ultratus"){kind=icon}
 "UPGRADE COMPLETE!"){kind=icon}
Thanks. Tried to make it easy to understand as much as possible.