My missiles.... oh my missiles...
The game itself is not back at all, and a long screen vertical shooter is still pretty rare for some strange reason.
The only gripes I have about the game: rapid firing maniacs like us will find our missile resetting its position if we press the fire button too quickly, resulting in a "missile shield" instead of missiles that goes all the way down the screen. It's the same programming mistake I made in 8th grade... you can put a quick fix on it by increasing the missiles you can fire, or putting a lock to the fire key when you run out of missiles to fire, but both of them are hardly ideal solutions.
the best solution, though, is to use duplicateMovieClip to create the missiles. That way, you can be sure that the missile supply will never run out (remove them when they're destroyed, of course)
best of luck!