Can you make an estimate of how long it took to make all this?
By the way, why did you use Blueprint and not C++? I know programming, and frankly those fat Blueprint nodes kinda put me off, yet I still find myself using more Blueprint than actual code. 
I think it’s because Blueprint is programming, too. But in a such a different why that just makes me curious.
It’s not against the law to make a clone, though. There are even tons of them out there already, commercial ones and free ones. And Mojang does’t even understand the law. That’s how Bethesda could troll Mojang regarding the use of the English world “Scrolls”. So for as long as he doesn’t use any actual content from the game itself, there shouldn’t be any problems here.