Colony Defense is a 360 degree tower defense game with a lot of arcade action elements. Your mission is to defend your colonies on 34 different planets from invading aliens called the Suona. All the action takes place on the full surface of a 3D planet, so you need to be constantly on the move to keep your colonies safe. You have 10 unique, upgradable towers you place along multiple paths, and an orbital ion cannon for when you really need to bring the pain!
As you progress, the number of alien spawn points increase along with the number of bases you must defend. It gets HAIRY! For each level you complete you can unlock special abilities that are vital to wining the war. Colony Defense introduces a new "spin" on tower defense that has to be tried to be understood.