the platforming in general in this game is actually pretty challenging for this kind of game. this isn't a complaint, i think it's really cool and it's meant to be played be adults so having everything be a little spicier makes sense imho. I'm just stating that compared to like ratchet and clank or banjo kazooie the platforming is relatively difficult.
imho you really shouldn't change anything about the platforming, i think it's really cool and want to see how far you can push it in later levels. but if you're really concerned about people not being able to see all the content like leaf's scene specifically, you could add in a "pity" mechanic where if you fail x (3?) number of times you can get the just skip to the scene anyway.
alternatively if you're convinced the course is just too hard for too large a portion of your players, i'd add a narrow piece of geometry like a rope or a board or some kind of cable between the first roof and the roof of the guard tower, since that's the trickiest part to do, and this is only the first zone.