your hitbox is behind you for your bite. As explained the first time you bite, holding b will lock your facing direction. You play the game backwards.. or is there something else? You didn't give any details as to what is confusing.
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it's to collect worms. Get to the worms. I thought the giant sign was enough. Would it have been better to show it as regular text? I'm also not understanding. The player is ment to be played backwards. Idk how else to tell you. His butt is his front. All his skills are built around it. You can't progress anywhere unless you go to the overworld and collect a gold worm. You should have found that exploring the only place you can go as it's right in front of you. Then text explaining what to do to progress. Did none of this show? Did you not read it? Did you not find it? Any info would be lovely.