Yea I turned lvl 17 today too. Not touched the blue shelf yet I have all my expansion completed on the main green. But to clear one huge obstacle here (wicked thicket) cost 100.000 I plan on putting my gardens farms here on this section, for now planting around it doesn't look so bad. I decided for me I'm going to hold off on the blue until absolutely necessary for space and I'm bad at mining.lol