Interesting idea and nice game!
The camera needs some work, I think that when the character is moving the camera should follow and be moved freely when the character is still.
The back from the how to page doesn't work and the rest of the menu becomes inaccessible.
Overall I think you should have made less levels and focus on making them more complex, as it is now I never had to actually think to solve a level, it was just a matter of doing the necessary steps.