Want a idea? I have it =D
I present you the "Last Standing Tower"
The objetive is protect the tower and survive as long as you can
A wide map, with a thin but tall tower located on a pit, linked with the normal terrain with some brigdes.
The tower center is filled with lots of small (very explosive) devices/generators, linked together (just like a humam' spine, with a small distance btw then, enought to when some of those devices explode, create a nice, deadly chain reaction.)
With the brain placed in the top of the tower, will attract the enemies to go exactly where we want. Now take a look at this:
Lets say that the red thing is the is the devices linked, the dark grey is the bunker, white is the BG, light grey is the brigde and stickman is your clone.
But why that fall before the device?To prevent the enemies from shooting from outside
The top is where is the main reactor and your brain is.
Enemies destroy your device? OSHI!!! *chain reaction* BUUM BUUM BUUM BUUM!!!!OMFG!!!!11!! THE EXPLOSION REACHED THE MAIN REACTOR!!!111!!@! *Explode, your brain is liquified, the whole tower turn into ashes*
Good, don't you think?