Too short, weak punchline
It's just not finished... Yes yes, minimalism, whatever. "Minimalism" only works when either what is presented (or not presented) is of such great significance that nothing else is needed to make the piece great.
Though the "treeclock beats puppies" idea could potentially be funny, coming out and stating it at the end is really overdone. I was waiting for some kind of hilarious punchline which never came.