Here is my basic maze:
As the game goes on I would extend the top row and left-hand column to their maximum (this buys you time!!) and start placing higher value turrets in strategic positions.
One thing you will need to do is place a DCA centrally for the initial flying alien wave (level 7), and even then you may need to supplement this with one or more vulcan turrets.
I invite you to leave comments about this game (please note I am not the developer), I'm sure we can beat this eventually!!
If it's too much maybe try something else , such as PSP games
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