8-Bit action RPG mockup

[RotateMe]

I had some little free time and since I couldn't get myself to work on my main project (http://www.wayofthepixel.net/pixelation/index.php?topic=10462.0) I made a small mockup for a game I had in mind for a long time now. I used Arne's wonderful generic 16 color palette (http://www.wayofthepixel.net/pixelation/index.php?topic=4306.0).



The target zoom is 2x so you might want to click on this image one time.

The problem I'm currently having is drawing walls in this style that go from north to south.