This is really great! I wasn't expecting a lot when I tried this, since I've seen a lot of bad attempts at this sort of thing, but this really blew me away. The worldgen options remind me of some of the things you can setup in Terasology, but the whole experience is a lot more cohesive and setting up a world is far easier.
The only thing I would like to see added is some sort of death animation; I wasn't quite sure if I'd killed some things at first because they simply pop out of existence (coming from MineCraft, I thought they might have teleported away).