So final instructions are "meet me a few worlds away", "meet me at the harbor" and Bunny saying I'll open more quests.

My thought is two things are throwing people off.

"The end"
and
The next quest is named "main street" not "the harbor"

I remember myself being confused, trying to click on the ship.

My assumption is since the harbor is not unlocked next and people are looking at the ship. They don't see the next quest, hence thinking that is where the game ends.