How am I supposed to get to 1-?

Are you asking how to unlock Parrot?

if so, scroll down for a hint or scroll down even more for the exact details. If not, nvm.

Hint:

Bone the dead fish

Exact:

throw three bones at the dead fish skull in 1-3. Kill the boss that spawns, Big Fish. You will now be in the Coast and have parrot unlocked.