Well whatever the case is with this, I had to stop in and say it looks *really* nice. My only concern is the small window in which you move. It seems a bit cramped to me. I'd suggest black and white sprites and utilizing the full screen(unless it has to be in grayscale)so you get a bit more room and so speed isn't as much of an issue.
I've since changed the tilemapper to a scrolling 4lvl grey 16x16 full screen tilemapper, and it runs faster and less flickery then my original one for Pokemon. I'm currently working on getting a new tileset together, then maybe I'll post a screenie, but I'm really focusing on other things right now, as this is on hold.