I really liked this! The artstyle is great, right down to the colours you chose for the itch page. I checked out the book you mentioned and I'd say you nailed it! The text really sells the game on the children's book aesthetic.
As for gameplay, the collisions are a little awkward at times, but I don't mind. One thing I'd personally change is the time it takes to recharge after the ball hits something, it feels slightly too long.