I could recognize Sebastian Lague's controller anywhere, always makes me happy to see :)
This is a great idea, using the countdown as a physical obstacle is really smart and well implemented, my main critique would be that the blue levers look the same despite them doing vastly different things which got me stuck for a while as I assumed they would all pause/unpause time since it was the first I discovered, once I figured it out it was smooth sailing though! I did get tricked by the timer going to 100 and making me lose (although it makes perfect sense in retrospective).
Otherwise it's very clean, great level design and very enjoyable puzzles; good job !