Really fun platforming concept. It seriously made me question myself when I would continuously dash to the exit on my first attempt and then every subsequent portion would be hell to run through. I also kept backing up to get a running start, which didn't work out well for me. That being said, I think it might help to add a button to reset the whole level back to the first shadow that way if you screw up and make the level harder to platform maybe you can try to make it easier by thinking through the process.
I also think that it would help to add some coyote time on the jumps, I think it's really helpful in most platformers to have a small grace period after leaving the platform to still perform the initial jump.
Great aesthetic and concept! A lot of fun and a lot of interesting directions it could go from here!