The level with the bird (duck) moves the story forward, and after that, another animal will eat you as the worm — and from there you’ll reach the ending fairly quickly.
That’s our issue — there were so many details we wanted to show, and until the very end we didn’t want to use any text in the game. We aimed to convey everything through visuals and symbols. But as it turns out, not all players are willing to engage that deeply with the process, and sometimes it’s just easier to explain things with words :)