Yeah, Level 1-3 has gotten notes from other people too - bad level design on my part. I balanced the times based on what I could achieve, which is unfortunately biased because of my slower computer. Sorry about that.
Are the moving platforms spinning uncontrollably fast? That may be a framerate dependency issue, which happens by mistake from time to time. If your computer is operating at a really high FPS, that problem will be magnified.
Perhaps extra fuse time boosts could be seeded in the levels to make it easier to finish. Maybe an alternate mode where you really HAVE to do it without extra time, and boosts are added by default. Could be interesting.
Thanks for playing and the quality feedback!