I was bored and got an idea so I made Alliances. Right now the concept is good but the balance is off. In a 64x64 tiles an enemy comp take the top left 40x40 sqaures and 7 humans are along the outside building in melee style. The humans start out allied, but eventually must kill eachother. The comp sends waves of hydralisks semi-frequently. The trick of the game is you have to kill other humans, but you have to also protect against comp which you can't do in the middle of a micro war. Right now the balances is off, so it's not that great.
Feel free to tweak with it. (change Zerg attacks and frequency of attacks)