I really like the cute artstyle and the idea of the cat with the nine lives. I also enjoyed the animations and sound effects. The game really embodies "failure is progress". I would maybe add a losing state for when you reach a point where you have spent lives but some of them aren't placed right and you have no way anymore to reach the top but don't notice it immediately. It can be frustrating if you accidentaly push a box down but still have enough boxes to progress further and when you almost reach the top you realize that there are not enough left to win. So it would be good to have the game automatically restart if there's no chance to win anymore.