If you are looking for something different, Harvest Massive Encounter m…

If you are looking for something different, Harvest Massive Encounter may be for you. In this game you must defend your resource gathering colony from successive waves of UFO attacks. The nice thing about the game is there are many different modes of play that range from insane to creative where the UFOs do not attack at all. Download the trial and try it out.

There's also a walkthrough I put together which has some great tips if you get stuck.