The art was cute and you have an interesting idea, but the game was difficult to play. I managed to make it to the end, but I don't know if I would have if there had been more than one level.
I couldn't figure out how to get out of the note screen. I had to refresh the page in order to play more. I was able to jump over it, which let me keep going. I also had to refresh the page any time I died, as I couldn't figure out an in-game way to restart.
The countdown timer was an interesting way to keep the player moving, though I think it would have been nice if it had been mentioned somewhere in game without needing to wait and find out. I will acknowledged that finding out myself might have been less annoying if there was an in-game restart, as it did make sense when it happened.
Time stopping mid-jump made timing some of the landings a little less intuitive and a little more difficult for me. I kept wanting the'fall' to count as movement. I don't think it's necessarily a bad thing, but I don't know if I ever fully wrapped my head around it. I do think having time, and enemies, stop when you stopped moving was clever and could make for a fun platformer.
I think you have something here that could make for a fun game, but it needs some work to make it enjoyable.