Simple and cute with good ideas, the tail interacting with buttons is clever and the stairs are genius. The level design is well thought out (Most of the times, that ladder and two blocks level is more art than science) and carriest out the game by itself.
Theme, the only jump is implemented but diluted in a sea of other interesting mechanics.
Originality, the only jump has been done a lot even more in puzzle games so that has no originality, but what is unique is the rest of the mechanics mentioned earlier which scores some well deserved originality points.