Scroll right all the time following the arrows. Any weapon is okay to use but avoid trying to kill the dark brown raptors as these are seriously hard. Once you get to the jeep, keep firing at the T-Rex to keep him at bay. The best place to stand is on the roof of the jeep. You can avoid the bullets from the enemy sprites by jumping up after they have fired. When the jeep starts shaking and the music reaches its height, it is time to jump onto the overhead vine.