I played through it last night. I agree that it was too short, considering the size, but it was still a lot of fun.
It's influences include Dungeon Keeper, for its unadulterated celebration of evil, the Black & White style tour guide/mouse-heavy controls, and Pikmin.
The sound design was excellent, particularly the grumblings of the minions as they leave and return.
Great sense of humor too. The graphics worked well for the style but didn't seem particularly advanced.
Control mechanics were somewhat cumbersome (no mouse inversion?) but I found it was easiest to pull the view up, almost 3/4 overhead, and it would zoom out to a comfortable level.