The Chest thing, I can fix.

The Bottom-left Cave is the Dungeon, and the obtainable Item is the Switch-Hook, so it requires you to come back with the Feather to get the item.
The cave under the water is one of those generic mini-dungeons you can go through to get a ring, to extend play-time.
The three stairs that go below go to one specific cave, that is actually significant later on.
And the cave in the Mountainous area takes you to the...Mountain area.
Anyways, worked on a bit more, not updated anything yet, though. I'll start more sometime tommorow.

Well, I've been working on maps, in an Area, called Sprite's Forest, around the Second Dungeon; Level 2, Pixie's Palace

I've done 9 of the 34 maps needed for Sprite's Forest, but I just need an opinion around the Dungeon area.

EDIT: Done more, just need to upload it.

So, otherwise, it's impossible to add your own music?

Can you add your own Music to it?

I know it has to be a certain format, whatever it is, but can it be added/replaced?