It does not matter that this is a Minecraft clone, there are hundreds of them and mojang has always been fine with them.
Minecraft itself is inspired and started as a clone of infiniminer.
The general rule has always been “as long as it does not use assets or code made by mojang” its fine and they wont care or sue.
Unless this tree is using a stolen texture from the game there is nothing that makes this more illegal then the thousands of cloned already out there.
Of course a doubt microsoft would respect such, they shown their hands when they presumed ownership over the now open sourced end poem.