Stop ships from shooting
In the first stage, do not shoot at the ships as they go into their formation. Once all the ships are in formation, isolate the first two (yellow/blue bees) on the left side. They are in the first column of bees on the left side. Kill all the other ships except these two bees. After all the other ships are gone, allow the two bees fly and shoot at you for the next 10-20 minutes. Do not shoot during this time. After some time, both bees will stop shooting. Allow the bees to finish 3 to 5 more passes, then kill them. From this point on, ships in the game will no longer shoot.