I love the look of this game and I think you nailed the theme. I found the gameplay very hard to the point where it became not fun. I think some improvements could be on the controls and maybe changing the order of how difficult things get.
There were sometimes indicators where needed to help assist the player on what to do and some other times the indicators were confusing.
I really like the idea of the trampoline books but the physics of the way they worked didn't feel right.