Minecraft Jumpchain

From the introduction: Welcome to...well, I don't really know what this place is. Besides cubical. There's no curves, and nothing has an angle on it that isn't a perfect 90º. The dirt, trees, leaves, clouds and even the sun and moon are cubical. Your tools are made up of lots of little cubes of metal and wood that somehow stick to each other. Looking at this place, it's kind of like a big sandbox you can play in. Except that everything is cubes, and some of the cubes are trying to kill you.