Get the password card (Cosmic Symbols) from the goth girl in the second floor loft of the Mill. You will need the Secret Message from the Maid's room in the castle (first floor left).
Press the three symbols, and the sun, on the plaque on the village fountain.
Done!
You do not get or use a bucket on Astro Knights Island.
There is no treasure chest on Astro Knights Island.
There are no bird eggs in astro knights island.
its on the island
How do you talk to the girl in the hay loft at astro knights island?
There is nowhere to enter a password. Fix the saucer and get the coordinates you need to fly it. (see related questions)
On every island you have to be the one to save whatever needs saving. That includes the kingdom in Astro Knights Island.
Once you have built a new spaceship on Astro Knights Island, it will park on top of the castle whenever you leave the island.
on astro knights island
With Mordred
Astro Knights