Sift Heads World Act 4, Starcraft 2008

Game Info - The most lethal threesome in the internet comes back with the four part of their adventures. Press the space bar o grab your weapon and R to reload. Point and shoot with the mouse.
Game controls - Use mouse to aim and shoot. Space bar to get weapon. R to reload.
  Game Info - New version with lots of improvements!

Get your sunken colonies in place and take the marines out as they come.

You’ll be confronted by increasingly stronger forces, so it’s a good idea to maintain and expand your defensive capabilities.

Note: This game requires a lot of processing power.
The game file is rather large at 9MB.
Game controls - This game is fully mouse operated.
Build defensive structures and special buildings.
Use your powers during combat to help your defences take out enemy units.
The Overmind must survive the attack waves.
To raise experience levels, use your powers to kill enemy units .

hotkeys are 1-8 for spells and 9 for the Zerg Queen.