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I love the added fire power I get from the bi planes in the early section of level 4 but they almost never last through the end of the level because they take up so much extra space it becomes almost impossible to dodge enough bullets.
I have managed to get them to last me up til level 8 but that was once.
This game makes me want to tear my hair out. Have never made it past level 12 and iirc that's only half way.