I like the idea of having a separate overlay tile, that might make things simpler. Also yeah, the creator of Hex Kit seems to have largely disappeared. I found the formatting guide on an archive of their site on the wayback machine.
As for the file structure, Hex Kit expects a series of subfolders, as pictured. There isn't any special naming required. If you want to see a great example, buy the pixel hex 2.2 pack on itch. That's the most comprehensive set I've seen. When importing the folder into Hex Kit it'll ask you to size the hex art and generate the settings.yml.
This tileset is a little difficult to size just right because slight overlaps of the transparent sea tiles are very obvious, but it wasn't too bad.
Happy to help if you have any more questions!
donutrj
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Beautiful set! I use Hex Kit for my maps and after resizing the tiles (they expect 210x210 @ 200dpi) it's been great.
I would love to have some river/lake tiles and paths that split in multiple directions. For the purposes of layering I think removing the tile edging on the specials would be good as it prevents those spots from having darker borders. Excited to see what else you make, I've really enjoyed using this so far.