How about a dash of Z. (Team based Capture the flag)
a measure of Dungeon Keeper. (mazes, traps, places to hide/ambush)
and a handful of Worms. (Fun characters with big weapons)
Blend for a few months and then Kill, Kill, Kill.
An Isometric viewpoint would be great, but then again the overhead view may be easier depending on what code you've already got.
I'm detecting a pattern in those names.