Great art, but unfortunately I found the tiles to be somewhat misaligned (especially the cross shaped piece of land), making it impossible to upload them into a program such as GameMaker to use as a tileset from the get go. I went through each tile. editing and shifting them around so that all the pieces fall on a neat grid, and I added an alpha layer so the background is now fully transparent. Here's a link so you guys don't have to go through the same rigmarole:
http://imgur.com/pt1DMHd

Still, all credit for the art goes to the original artist. Great job!