Two trivial or amusing things I've noted.
The fish doesn't stick to walls are creatures, right? Only, it
can stick to the black jellyfishes in Mithala. Imagine that. Bubbles don't do anything though.

You know those little pod spawning rock nests you find dotted everywhere? Eat one with your beast form. It's quite entertaining to shoot little pods of your own.
I've also noticed that the game tracks your 'ammo' in beast form. When you use up all your shots for your most recently eaten creature, you'll start firing your stockpile from the creature you ate before that.