You could try Evil Genius, you build a lair for your well, evil genius. Place traps, hire mercenaries, etc..
There is also theme hospital, dungeon overlord (a browser based game) and there was one more with a space theme, cant seem to remember the name atm.
For some reason no one ever picked up where DK and DK2 left off. Rip Bullfrog
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I enjoyed evil genius the most. Still not as good as any of the DK games.