The object of this game is to climb higher and higher using your grappling hook to pull you up. The trick is to aim using your mouse, in the angle meter at the bottom of the game. The angle that you position the cursor at is the angle you fire your grappling hook relative to your character. Once you think you have the right angle, click your mouse button to fire, but don't take too long or you will fall off the screen.
Play Wire Hang.