I created these tiles to be 64x64 pixels so they could be really optimised for a 32x32 tileset, as you can effectively reduce the tiles needed in the tileset and still create the same maps depicted. In addition I created these prior to any alpha png usage available in GLB, therefore I could create a seperate set of blocks to deal with the shadows which would simply be another map layer and would look awesome when sprites move into shadowed areas. This I will endeavour to do. In addition I think I will optimise the tileset for 32x32 tiles as it will really bring down the size of the tiles needed and give people a choice too as to which size they prefer to use.