Try to do something like in this tutrorial: https://www.scirra.com/tutorials/398/to ... ntrollers/
It is for JoyStick, but you can move into any direction.
You can't seem to post urls yet.
You could use int(random(360)) degree to move them away
That's pretty much what I did. Disabled 8-direction, enabled bullet, set randomized angle and reverted the behaviors when the flight animation is over.