It starts to change as you progress through the game.
The story mode is traditional and broken up into different worlds. Each world requires you to complete levels until you reach the boss. Each level requires you to complete an objective before you can move on. At first it is simply defeat all enemies, but it starts to change as you progress through the game.I suggest bombing his back legs first, then the front. This way when he collapses, you won't have to go far and lose time bombing his head.These levels have a certain number of switches that you must walk over to activate. There is another version of this late in the game that has them hidden, so you must blow things up until you find them.She flies around in a heart-shaped machine with wings. The trick is to wait until her wings go on the ground, then bomb them. This happens when she makes an electric gate you have to stay out of and when she thrown them underneath her.