Become a living wrecking ball in Wreck It, and then swing your way to victory.
Your tank will follow your mouse, and by pressing space or left click, you'll pull your ball toward you, utilizing the distance to gain momentum.
Kill enemies or collect XP from the colored blocks to level up and unlock more types of wrecking-ball tanks, some of which have either bigger balls, or many more balls.
There's no real need to be aggressive. People are generally quite hearty, so it's a good strategy to just focus on farming XP until someone decides they want to mess with you.