(DLsite warning - the game I am linking to is not porn but the site I'm linking to contains a lot of it)
A silly flash-exe game I spotted on DLsite. There's a free demo which is enough to get the vague idea across. You appear to be some manner of EVIL WIZARD lurking at the bottom of a dungeon. A variety of adventurers slowly shuffle along the dungeon passages to get to you. You attempt to stop them by summoning monsters and activating traps in their path.
It's a Japanese game but all the text (what little there is) is English...
Game site here.