Nice. I like the style and the colors used. :) Unfortunately there are several issues which will probably prevent people from using your tileset.

- There should be no background pattern people have to edit away first. Transparency is most commonly used. A single color is an option, too.

- The resolution of the image is 7 times higher than needed. The original resolution is 225 x 225.

- The tiles are not aligned in a perfect grid. The only way to use that tileset would be a texture atlas people have to create themselves.

- The tiles are of uneven dimensions. Some are 31x31, some 30x31 and others 31x30. If you want your tileset to be compatile with others, the standards are numbers of power of 2: 4x4, 8x8, 16x16, 32x32, 64x64, etc. - for all tiles.

- As a suggestion: One can't create grassy areas because the grass tiles don't snap with each other as their edges are not smooth like the dirt tiles and because an all grass tile is missing. That can be just a choice of style, though.

For demonstration purposes i removed the background and shrinked the image down to the real resolution. The uneven grid (as shown on the right image) and the tile size issues remain.