loved this game like its been said once or twice its a shame people think that the first 5 mins of game play are buggy. i got the point right away the only thing i had a problem with was trying to find the upgrade places but eventually after taking a few mins to fly around the areas everything made sense. great game and the fact that you didnt have to kill EVERYTHING in every level was what i thought was the best. wave style games are so damn annoying when you pick the wrong upgrade or something. this was such a good game i eneded up playing it for 3 hours start to finish each and every mission while doing chores around the house lol. not very often a game hooks me this well but if i could i would give this game 3 thumbs up if i had an extra thumb lol