Atomic Creep Spawner

Here's another interesting one. Heroes invade your dungeon, you spawn enemies to combat the hero. Your points to spawn enemies goes up as the hero causes damage to the dungeon. More of an arcadey clicker than anything strategic.
Also not anything that's going to keep you involved for more than half an hour, but it is a neat diversion while it lasts.

http://deepnight.net/games/ld25-atomiccreepspawner/