New blocks please!

We need mossy chains. Also, a space-type block like for space SMPs. I think mojang/microsoft should add new world types, 'Space' and 'Big Flat World', which could be bedrock, then deepslate, then stone then dirt. The Big Flat World world type could be 150 blocks deep, making it easier to make underground bases in flat worlds. Thank you for reading! Have a nice day! ='D