I was sucked into Wratch's Den by the Dungeon Keeper-inspired graphics, but found a totally different game when I fired it up. Not disappointed at all; it's a fantastic experience. Fans of nitty-gritty tactical games (like me) will love it.
While obviously inspired by Dungeon Keeper, it's a totally different game. It's not a builder at all, it's actually a time-based tactical game. And it's loads of fun. 4 difficulty settings and an endless loop survival mode give this game pretty good mileage. Could use a little more love - some balance tweaking in particular - but it's in very good shape as-is.