Yeah, it's like Project Zomboid....there are 3D models on a 2D world....however games like that are simply called Top down or isometric games, no matter on 2D or 3D stuff...It's simply an Isometric game, and the great advantage is you can build easy an huge world than on a 3D ones. The world of Salem is awesome indeed! As far as H&H.
P.S. For the guy above, in Xsyon there is pvp, for sure....there actually are 2 servers, pvp and only pve....there's not permadeath from what i understand....but you lose stuff and skills and you are teleported to your claim....like KO on Salem.