Very good work lobster, im inpatien to see future update !
but do the Undo/Redo first its a but long to use the remove tool and if you delete one you need bref its long .I also request you to improve the color choice go here for some idea http://www.rapidtables.com/web/color/RGB_Color.htm
also for tool idea ( im sure you will do it) add line and square ( for square I means like create a x*x*x square ) for the grind you should let's the player chose the grind like if he want a 1*1*1 or a 500*500*500 ( maybe for that u need to set a limits haha) 3d texturing is a good idea but if I can upload my proper texture from my desktop would be better ( I don't know if you can do that ). Also change the color of "Design and coding by lobstershow" in green cause turquoise in grey-blue is hard to read and green is my favorite color. Now my last request do a delete all tool ( its simple its destroy any cube you set)
p.s ( I alway do long comment I don't know why)
I think this game have a good pontential the sky is very beautiful ,the tree have a good graphic but I think the rotation of camera is a bit to fast it easy to lose the focus so if u can reduce it.. .you can also create a multiple kind of tree for more realism like cactus ,palm tree ,rose and more.you can make animals like bird,and u can make water and add fish :)