If you want to clear a level easily, simply put a "Goal Point Question Sphere" somewhere easy to get to in the level. That will act as the normal exit for the level (If you want to get to the 'Secret Exit', you'll have to either get there yourself or make a new one). To place a Goal Point Sphere, click the Shell and the Blue Yoshi icons at the top of Lunar Magic, then on the drop-down menu in the Add Sprites Window find "Tileset Specific Sprites". Once you are there, look for Sprite 4A, left-click out of the sprite menu (but leave it open), then left-click on the sprite to highlight it again, right-click to copy it, and right-click where you want to paste it on the level. From there, drag it wherever you want to by left-clicking, then save the level and run it in your emulator.
*I know this reply is a bit late, but other people are bound to have the same questions.