How do you beat the game on Transformers Autobots

Keep getting behind Megatron and punch him in the back as much as you can before Optimus is detroyed by the drones. Once Megatron drops the Allspark pick it up and smack Megatron with it. Watch the cutscene. Now fight Megatron with Optimus until he dies. There are 4 decepticons you can kill for health. Megatron will occasionally destroy a tree or so and if you are lucky you can get that health. Once he dies you will watch the last cutscene. Good luck!