The collision box for the spikes is too big. As a result the cats get hit long before it looks like they should. Having the bottom cat be able to move while the die is rolling makes it feel like guesswork where the bottom cat should start. Also, having one of the cats barely be able to make even a small jump is just annoying to deal with.
I got through a handful of the sections, then stopped because it felt like they were just repeating with no difficulty curve at all.