Hello, well in world A i was wondering how to make a stone island and include lava... i think you didnt finish the part for stone and for lava... so i triied an edit and it works :) I'm proud of me ^^ but maybe you already add something to do it like my screen... if yes please tell me where in the tileset... because if you do an update of the tileset my changes will be erased.... :) 

this is my edit of A1 :

this is my edit of A2 :

Nice mapping. Your island looks very good. 

You don't used the stone texture and instead the black sand. You can also build any lava  and make a transition with another texture in the B folder.

Just want to say because I planning to add a grass lava on your tileset spot :)

Thanks to your tileset :