small advice: part screen with 9 buzzsaw (line in the middle), add launchers at the ends, later everywhere, 5 proxy bombs, as many turtles as posible. 1000,000 in 40 minutes.
There is an easy way to go to the next lvl: ill give example: there are 4 empty slots for 2 bricks. when u try to put those bricks in "1" and "2" and X on "3" and "4" and the game shows that u still need to put 2 bricks there. it means that u must put it in other way. put bricks in "2" and "3", or "3" ,"4" and X's in other slots. in right position game shows that line is ok... sry for my english xD