Play tonic... What else?
I was thinking about the word "quack" having nothing to do with ducks per sé. But the inspirational quotes are very ducky...
But nice one on the quack, could very well be smart wordplay
Now to link some information together we currently have...
Alot of business going on in Yooka Laylee, Trowser confirms this once again. Also, alot of animals, we currently have: Chameleon, Bat, Snake, Dinosaur, Bee, Duck. The banjo series also had many species of animals!
It's zootopia all over again!
Still difficult to find a link with these things and the storybook...
Perhaps all those copper pipes from the screenshots are related to the juice that is play tonic, some kind of enhancing liquid.
Perhaps this liquid is one of the assets?