I really enjoyed this little platforming experience! Got me trying to beat my best time.
A little suggestion from me is adding a shadow under the fox so you can more easily see where you're going to land. Also i got soft locked on the shelf when the boxes fell and i could not longer finish and had to restart.
This could turn into a very nice game with some polish on the controls and visuals, a little story and some more levels. I hope you continue this!
Very nicely done!