Feedback:
Maybe choose a different name? The name sTile is already used by this program here:
http://www.harmware.net/stile.htm. I first thought that this was a new version of that program, but they are different.
It runs fine on my old computer. Yay!
Max tile size is 48x48. This could be larger. I think 64x64 or 128x128 for a max size would be a better choice.
The default right mouse button behavior of the pen tool is confusing. At first I thought it was an erase, then maybe something that grabs nearby colors? I don't really understand what it does, although I did find the button to turn that function off and just use 2-color drawing.
It would be nice to be able to edit the default palette. Store the default separately so it can be loaded with one button click, but allow a user to construct a different palette as well. Maybe just a load/save palette function would be enough.
The map editor screen has two buttons on the left that don't appear to do anything. Otherwise a very nice feature.
There is no way to input RGB values directly into the color selector.
It would be nice if the buttons had a hint or tooltip. Some of them are not obvious (like the yin/yang for lighten/darken) so a tooltip would really help.
The RGB vs SL slider is a great idea. Maybe consider adding in an Lab slider to that?
Overall, I like the interface, and it's got some good features like the map editor. Thanks for offering it for download.
Tourist