No matter how good it is, I just can't get past it being a blatant rip-off.
It's alright to incorporate aspects of previously successful games. But this... well, earrg. It's clear that the developers looked at Notch's huge money pile and thought, "Mmm, gee, I sure wouldn't mind getting my finger in that pie." So they went and made Pixelcraft 2D. And they don't even have the Fortresscraft excuse of bringing it to a new platform.
Also, the blocks are too small.