The first and most simple enemy, the Crawler simply crawls across the platforms, cannot jump or fly (unlike Hoppers, Zippers, Repulsors, and Chasers), and only do three damage at a time to you. They give you three EXP every time they are defeated. They are found in all regions: Grasslands, Caves, Ruins, Forest, and Clouds.
Crawlers are red enemies with bumps and no legs. They squirm and have the appearance of a reg slug.