I think that would count as another DAPP.
http://voxelnauts.com/
The word "NXT" doesn't appear even once on that page. How is it running on NXT platform exactly?
For me it's an application utilizing some Nxt functionalities. It's not a decentralized application as the definition allows it. (Running on several nodes, unstoppable, can-be-trustless..)
Yes, you are right Passion_ltc, voxelnaults is not p2p application, I already have mention the issue a few posts up.
Nevertheless, it is good to see what kind of projects that are build over/and/or use 2.0 blockchain functionnality, especially of the span of voxelnaults. I have suggest to jwinterm to add another category where normal apps that use 2.0 blockchain functionnality may be list. This will avoid any confusion with true decentralized p2p apps (dapps).
Edit: @jwinterm, for a label, I would add the category "Applications using 2.0 blockchain functionnality". I also think 1.0 non-decentralized blockchain application are not of interest in this topic (e.g. exchange, gambling site, etc...).