Nicely rounded game! A simple idea well executed. The difficulty feels very punishing to me though, maybe I'm missing something. I can only get about half the way in the first level before the timer runs out.
Hmm, Thats strange
Sent you a video on discord of a failed attempt, hope it helps!
Just saw it, try not letting go of the mouse, see if that helps. I designed the levels so you should finish with ~1 second left.