its a great game. the story kinda sucked but who cares?
the game is easy. all you haveto do is use the big gun as much as possible and aim for the stronger enemies first. fully upgrade your gun then fully upgrade your repair drones. after that get more fighters and when your done with that upgrade your fighters. after you upgrade your fighters you pretty much won the game because your drone fleet will be able to take out everything the AI can dish out
using the gun is pretty easy. the skill comes from playing dozens of games where you get something to fight with for example the trebuchet in The Great Siege