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So there's the stage where you have to evade the Leviathan. It's a solid stage, and I wouldn't change anything about it mechanically.
However, the one thing I kept thinking would be hilarious, but also fitting and kind of neat...
When you get to the last screen where he chases you, if little cats with weapons and armor started swimming alongside in the background/foreground. Then at the final screen at the stage clear, there was a monster hunter with his palicos cheering with a beached Leviathan.
Alternatively, replace the palicos with Cha-Cha and Kayamba. This is just a dumb idea that I think would be a great addition and reference.