I'm enjoying trying to figure out the overworld secrets since they are on different parts of screen so you literally have to bomb every wall to find if there is something there or not. I couldn't find a dungeon item in Level 2 yet though I've been to every room so I need to comb that over more carefully. Searching for a white sword or Level 3, and found Level 9.

Spoiler: show
In the feed the Goriya room in Level 2, maybe you need to have the room with a shutter for the side door, as I didn't have to feed him to proceed, and coming back to feed him doesn't seem to do anything unless I'm missing something again.