Your feedback has been good, Aristobulus. (I'm especially glad you pointed out the glitch with the shield song automatically appearing after a save.) Here's a little info about the mod:
The Main map was the first map I made when I was learning how to use the editor. The map kept growing larger as I wanted to try things out. At first I had no idea that there would even be other maps in the mod and as I was just learning, the main map has a little bit of many things that were in the main game - safe areas, dangerous areas, secret caves, hidden items, cliffs and water bubbles for jumping, and of course a variety of entities. When you start out, you are in the central area of the map near the central save point and close to the entrance to Naija's home. If you explore carefully, replenishing your health as needed with the save point and the strategically located health plants (which you can replenish by going in and out of the Garden warp point at the back of Naija's kitchen) you'll soon learn your way around. And if you want to find all the hidden items, of course you have to go everywhere, look at everything, and do a certain amount of backtracking. Especially if you're stocking up on food items, just as in the main game, there is backtracking. As far as it's being aimless, I suppose it is. This mod is all about exploring new environments and finding things, and your purpose in the Main map is to find the two songs and the costumes, and to stock up on food. There is a bit of a story later in the mod, but there's a lot of exploring to do first.
Spoilers:
The wurms: You can entice them away from the wurm caves, lead them to a neighboring area, and swim quickly around another way, leaving them behind. Then you are free to explore the wurm caves in peace.
The anemones: I agree that this area is obnoxious and you can die, and that's one of the things that will be made easier if another version of the mod comes out. But in the meantime, if you make a good leap off the top of the right-hand cliff into that cave, you should land cleanly between the two clumps of anemones. Once in the cave you can get out again even if you haven't yet found the bind song by climbing up the left hand cliff. Jump over the anemones, jump over the crab when he shows up, climb to the top, and you're out.
Other harmful entities - sharks, swordfish: Once you find the urchin costume you can kill them. Otherwise just dodge.
Believe it or not, I did try to put myself continuously in the place of a player while I was making Labyrinth mod, so it's good to hear what things worked for people and what didn't… Thanks!