Nice usage of Google Earth
At 1st I was surprised at the stunning backgrounds of the game, even the pentagon but after a while i realize that it was taken from Google Earth, what a innovative idea to get backgrounds and realistic too. However I'm worried about copyright issues and acknowledgements.
Oh well back to the game, ever since the release of raiden, verticle shooters have soar to its peak as well as going down steadily.
This game gave a new perspective to how the game can be played, including special weapons with even more characteristic (i love the idea of combing straight missiles with homing abilities), as well of upside down playablity. It is worth playing.
Great job!