I loved Dungeon Keeper , and I sure love this game
Mention about the inspiration by Dungeon Keeper would have been nice !
The UI was pretty nice and easy to learn and use, the graphics were very "retro", but seemed very fitting for the theme of the game. A little variation in the music and hotkeys could be added in a sequel... keep that in mind :).
The difficulty curve made a big jump at lvl 4... It took me about 5-6 tries to beat that level; I had to start over because I messed up with my skills. And speaking of skills, the skill tree seemed a little messed up :( , Some of the skills were not worth getting at all, and some others were pure gold.
Work on this,and make it better, you have my ten anyway :), I finished this game and enjoyed it a hundred percent.