As mention by the description and the other comment the timing feels a bit off at time, part of this might be down to the perspective making it a bit difficult to gauge the jumps. It may help to speed up the rope a bit so the jump timing doesn't need to be a precise, and it would be nice to get feedback when you lose on whether it was because you jumped too early or too late as there were a few attempts where that wasn't clear. I also didn't realise I needed to go back to jumping normally after one use of the mouses instructions, having him hide when you perform the right action would make this a bit clearer.
Overall though it's a fun little game and the art and music really fit the vibe!