IMO a subtle motion from Godzilla after getting hit would make the impact stronger and show us that this big ol' lizzard is hella heavy. No need to make extra frames, tweening would be enough. Also a split frame of Shaq is too static. Your effects are cool and i'd say it would be great to have them in that frame (like his eyes glowing for example or a simple panning).
But i'm nitpicking. Your piece looks great and i hope to see finished collab someday!