Wow what an intresting game!
First of all I like that you run away from books (but why Math & Bio which I like(I know I am weird)) and have to defeat them with the special ability of your current mood. Every mood from being sad and leaving deadly tears to being happy and dash in every book is well made and plays very differently which I like. All of that combined with a nice pixel art style and music makes it very great.
As a suggestion you could maybe add somehing to get a little health back like standing still when in fear (to simulate calming down).
Great job!