I nearly ♥♥♥♥ myself when I heard that someone was making a spiritual successor to the Dungeon Keeper series. Dungeon Keeper II stands as one of my favorite games of all time, and I still remember my disappointment when I heard Dungeon Keeper III had been cancelled. After playing several beta builds of War for the Overworld, I think I can comfortably say that this game is the one I've been waiting for.
Stepping into the game, I was amazed with what these guys have accomplished so far. The creature and level design does sway a bit "grittier" than Dungeon Keeper, but it doesn't detract from the feel of the game. The rooms are exquisitely detailed, which comes across especially well in the first-person view. The creatures are also gorgeously and creatively rendered, and each unit is fairly easy to pick out among the throng of minions churning around your dungeon. The interface is already fairly intuitive, with a few ♥♥♥♥les here and there. It can be difficult to select the right minion out of a crowd, and certain vital functions--the "rally" command, for example--can be a hassle to get to. The game could also benefit from remappable hotkeys, or any hotkeys whatsoever, for that matter. The devs have stated that hotkeys and remapping are coming in a later patch, though, so I wouldn't dock any points over it.
The tech tree is extensive and well-done, with some solid improvements over the Warlock research tree from Dungeon Keeper II. The tree is sorted into three "veins of evil," with your cultist accruing "sins"--research points, basically--which allow you to unlock "aspects," granting access to new rooms, minions, spells, and rituals. It's all pretty straightforward once you get used to it, but the tutorial doesn't do a great job of explaining how the tech tree works. You can fumble about with trying to attract a specific minion, only to find out later that the minion's specific room and requirements are tied up somewhere in the Veins. It's not a huge problem, however, and I'm confident the devs will add a better tutorial in the future.
The campaign's still on the way, which is the part I was especially looking forward to, so it's impossible to give a solid score at the moment. However, what the devs have accomplished so far is incredible, and very much in the spirit of the original games. If you're a fan of the Dungeon Keeper series, or a fan of base-management games in general, I would definitely recommend checking out War for the Overworld.