Hi.
If you made a new map in Tiled that's 20x15, then just input the same in MV. The XP one has a parallax image, using Tiled's export as image function, that was blown up by 150% to fit the MV editor. If you're using 16x16 then resize it by x3. The reason I had to do this is so you have a visual guideline that allows you to do events. You are supposed to delete that Parallax when you release the game. Since this is a tech demo, I didn't do that.