The plane boss in this game is loving impossible to beat, got any tips?
if you're talking about hilda berg
in the final stage, The Red UFOs only activate when you've flown past them, the yellow ones do not. keep that in mind because it'll purposely through a red followed by a yellow one to trick you
Coffee helps tremendously with this battle as you don't have to worry about a dash charm, and getting consistent supers lets you breeze through tough forms (although the extra hearts do help)
Make sure to parry as many pink projectiles as you can, parrying in plane form is much easier than it is on the ground
For the Bull form, i've found that staying in the bulls sights (but all the way in the back) is good because there's a distinct wind-up and sound cue before it elongates his neck, and if you shrink and dodge you can get out of the way every time
For the Gemini form, when she spits out that sun, watch the forget out cus it'll randomly start shooting projectiles at 12:00 or 2:00 or wherever, i got caught by that thing practically every time
and finally rememember shrinking, in the heat of battle i tend to forget to do it but it can make dodging projectiles trivial