Got as far as the cave bit (after note #5).
Spent 5 mins jumping around and repeatedly falling off platforms and gave up. Difficulty level of those jumps is a little much for me!
As for the animations etc, all works really nicely and runs smooth.
Jumping is a little un-intuitive at first but got used to it after a while. Theres a slight delay between pressing jump and actually jumping, probably due to your events that control the "hold to jump" action.
Had a second go using the "rewind time" thing. Couldn't really figure that out either. Pressed Y, pressed U. Didn't get it.
Looks really nice and has a lot of potential, but basically couldn't figure out what I was supposed to be doing or how to use the core mechanic!
Filled out the google form for you as well :)