Finished the demo. Levels one through three were really well-designed, and overworld exploration is very, very good. The custom bosses are a notch above those you made in Conquest, as well. Level four... well, the gimmick seems to be working your way through the level and hitting switches to open new paths. I think what made this more tedious was that there were a few rooms you had to travel through multiple times with block puzzles you had to solve before you could open multiple passageways. This is really the only thing that makes the level incredibly tedious, though I'm not sure what I'd suggest to fix that other than removing them entirely, and I wouldn't ask you to do that. Otherwise, it was a well-designed level.
Couple of bugs or random things to point out, though. In the desert, I didn't take a screenshot, but there's a screen that if you enter a cave and leave it, you end up standing in the middle of the screen instead of in front of the cave entrance. Then I have screenshots to show you:
No real issues here, except I think maybe that's a little too obvious. People will find it if they search around enough; Armos in a dungeon room with that setup seem suspicious enough on their own. 
There's no way to get back to the door on the left if you came through here too early.
Otherwise, keep up the good work! 
