Well, I think I explored pretty much everywhere I could. I couldn't get to dungeon #1 or #2.
Here's what I found wrong.
Red and green houses two screen south of the shop. Leaving from entrances warps you onto a mountain. Stuck. Taking the staircases and leaving warps you onton a mountain. Stuck.
Exiting the ring shop warps you onto a blue house. Stuck.
Blue house east of the green and red houses warps you nowhere. Not stuck.
Exiting the witch's house doesn't warp you out the door. You end up on the field next to the house. Not stuck.
Exiting blue house north of witch's house warps you next to the house. Not stuck.
Blue house west of witch's house warps you nowhere. Not stuck.
Green house two screens west of ring shop warps you nowhere. Not stuck.
Staircase west of green house warps you onto a bush. A sword spin can get you off of it. Technically not stuck.
"Treehouse" warps you nowhere. Not stuck.
"Treehouse" secret staircase warps you nowhere. Not stuck.
Big black rectangle two screens west of "treehouse."
Exiting the building AND the staircase where you get the graveyard key warps you onto a tree on a different map. Stuck.
Staircase in pond area warps nowhere. Not stuck.
Exiting Beach Cave from entrance warps you to pond area. Not stuck.