Space based 360 degree planet tower defense game gets a PC price drop to match the Xbox LIVE game price of $4.95.
Grab the cheap price here...
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Colony Defense is an arcade action tower defense game. Where you defend your colonies on 34 planets of alien hordes. Action takes place on a 3D planet, with 10 towers to defend. The game gets harder with more alien spawn points and more bases to defend at every level.