I have it on OneDrive here: https://1drv.ms/u/s!Ar9oADZiQciZm0AheS7uKZN51dHy?e=Oucx1x
PlatformerTilesTemplate.png is the template, and TileMapTemplate.txt has the instructions. The file on OneDrive is 512x512 with a total of 64 tiles. To slice it in Unity, use 64x64 pixel tiles (unless you resize it).
A complete set of all possible rotations and combinations of surface/underground/air. Use GIMP or your favorite editor to replace the blue, green, and white areas with your own textures.
