You really managed to make the mechanics of celest work and feel really good in 3D, but I gotta say for a jam entry this was a really impressive result well done :)
To give some feedback too, I think it would have been great to be able to save at another checkpoint again, i went out too far at one and then always had to backtrack to do something else, also a soundtrack would have been nice :)
Overall really great entry, I think you should expand this into a full game or mini game this has quite some potential :)