The more you progress the tougher the level will be. You will get instruction about what you need to do. The caterpillar needs food to survive. It is grubby, vengeful war in the underground. There will be many small crawling creatures and you have to shoot hordes and explore the terrain to get tons of dainties. When the caterpillar's belly have been filled by foods, it can take a power nap. Later, the caterpillar can increase its green bug abilities and can defeat the enemies easily.