This early access game was on sale on steam after I noticed that Dungeon Keeper 1 was for free on Origin. DK1 is great in so many ways, I played it for a few hours (320x240 or so, ugh) and decided to look around again for a "real spiritual successor".
I already bought "Dungeons" in 2011 but was greatly disappointed. WFTO seemed to be closer to the spirit of DK so I spent the 20 bucks in the super duper deluxe version. LO AND BEHOLD, I was playing it for the entire weekend. Game mechanics are exactly the same, however the atmosphere never really got close but that might be due to nostalgic reasons. It lacks a bit the dark humour and ambiance of DK but it's still a great game that has been getting s lot of flak due to bugs for the first few months.
The only weird thing I encountered was the abrupt ending that seemed to be completely underdeveloped. That was a bit sad. But since the mechanics are so close, it's a lot of fun and it certainly is way better than "Dungeons". Means, closer to DK.
I didn't encounter any disruptive bugs, just a bit of lag now and then when my dungeons reached a certain size. Taking into account that this game has been funded via Kickstarter and early access and did not have the AAA dev cash, it's really solid.
If you liked DK, you will like this one, too. And for the price, it's a no brainer to give it a try.