The final boss of a hat in time and the ending,thats about it.

As the link suggests here are the story book pages to get some insight for each chapter
http://ahatintime.wikia.com/wiki/Storybook_Pages

and for a final tip: to unlock purple time rifts you need to complete an artifact exhibition,each according to its level.

http://ahatintime.wikia.com/wiki/Relics

As per usual you can contact me only at [email protected]