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Well, I really like the colorful graphics and an original idea, since there are only a few micro based games. Making the planet level and grow before player's eyes was a brillian idea! Really keeps the player playing. Sadly, once you max the planet, the game loses one fun objective that keeps players playing. Of course, they will continue now because of sunk cost fallacy, but you could have made the planet grow some more. Also, something must be leaking there, because my game started running slowly after a while, even with no enemies at screen :S
Another thing that bugged me is unability do deselect an unit without having to click it once again. Many times, I had to scroll through the whole map just to deselect it, or I accidentaly damaged my planet by linking ships at opposite sides of the map. Could you prehaps add a keyboard hotkey for deselection?