Ironhand, I'm not actually using your tileset because I don't have the resolution for it, but I'm your fan and like looking at it so I hope you won't mind a bit of criticism
Walls are still too hard to tell apart from floors. The grey stones on other screenshots look acceptable but the yellow stone here is very confusing. I don't think I'm sight impaired but I really have trouble seeing the floor there:
In comparison, look at generic tilesets handle yellow stones:
If I'm not mistaken, the thing you've done is you made the colors brighter and perhaps increased the saturation of walls. But you need to increase contrast instead or, in other words, use more white on the walls. If you look at the vanilla game, it has black backgrounds for all floors, white backgrounds for all walls which make is easy to distinguish. By using black background for both, you are lowering the contrast and the distinguishing job has to be done by the tiles thelselves. And with your tendency to blend tiles, it's hard. It works for some (the grey ones above) but doesn't work for others.
I'd suggest using more transparency (perhaps even 100% in some placer) on the wall tiles to allow more of the white background to show. What if you deleted the white pixels you already have on the tiles? By painting white on the tileset, you make them colourable, by leaving them transparent, you'd leave them white.
But that's just my two cents, perhaps it goes against what you and the people who actually use this like. Feel free to ignore me and keep up the good work