Still Playing it? Any Improvements to Suggest?

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Hello to you guys! I use to go the computer shops just to play the game. It was quite interesting and entertaining to pass the time with. Its quite exciting too ^_^ For those who have and been playing the game, do you have any ideas on anything to add? A new vehicle? What projectiles would it use? Stage lay out? A new game mode? Improvements or suggestions about this very nice game, please share them ^_^