[X] Stay in your current form. If it ain't broke don't fix it, and you're 99% sure the geese have no way of harming you when you're all scaly. Aside from your wings. Your injured- okay you'll give shifting them out of existence a shot.
[X] Shift up to your true form. You are a dragon, dammit, and these geese will learn respect! This whole maze will quake before your might, and Abzu will be suitably impressed by the full force of your draconic power as you sweep the flock away and tear the maze asunder! Presuming it holds under your new weight. Which it will. Probably.
[X] Shift down to mortal form to fight the geese. Theoretically your wing can't bother you if you don't have a wing, and through half-shifting you'll still have full access to your claws and lightning. If anything you'll look even more impressive, transforming on the fly like that. And Abzu's watching.
[X] Shift to your coward form. You have had enough of these goddamn geese in this goddamn maze for one day, thinkyewverymuch. And besides, Abzu will appreciate the ride.