This is not a Minecraft clone. 99% of the projects out there that claim to be Minecraft clones are not close enough to be called clones either.
The real draw of Minecraft comes from a number of core features, most importantly the crafting and the survival needs that motivate the crafting and building. Minecraft would not have become a hit if it was just a creative sandbox alone. This project has neither of those aspects of the game. Another thing missing is the diversity of biomes. And another thing-- all of the underground features like caves and mines are missing.
So it doesn't have Mine or Craft, don't call it a clone. You wouldn't call something an IBM clone if it was missing core features of that computer.
I think people do the part with just the blocks and rudimentary generation and call it a clone, it's almost like they are giving themselves credit for recreating Minecraft when they haven't even implemented 1/3 of the features, and they didn't even recognize the most important ones.