I like the simple and gentle feel of it. I couldn't find the item menu to reset the bell so I got stuck about level 6 or 7 - just after it changed theme.
Adding the button pushing to the task is a great escalation to the game play.
At the very beginning I wasn't sure the game was working because I didn't understand that the boxes only moved opposite the direction the cat was standing. Maybe I'm just dumb? That caused me to get blocked and without a way to reset and start over, I think you might lose some early users that way.
But on the whole I really like were the game is going.