My strategy 1.Move to the bottom of the screen and move when a ball comes,2.move in a big egg-like cricle (from bottom to top),3.Move in a smaller egg-like circle tha covers three bottom pieces of the wall,4.I thin this is the most helpful part,did you notice that first the top 3 cannons shoot and then the bottom three,so just go from bottom (if top 3 cannons shoot) to top (if bottom three cannons are currently shooting).5.In this part just avoid!,6.I noticed that the snake always appears in the bottom right corner and always will show up in that space where it missed you.7.Combine phase 2 and phase 4.Thats all from me,i hope this helps.
 "Streamline"){kind=icon}
 "Decora El Igloo"){kind=icon}
 "Thing-Thing 3"){kind=icon}
 "Indestruct2Tank"){kind=icon}