Nice work. I enjoyed what I played.
Suggestions:
- The potential energy stuff should be explained more clearly early in the game (either purely through the level design which can demonstrate consequences or more clarity in the hints). I was quite confused for a fair bit of my play through.
- I assume the UI probably wasn't the focus during the jam (which makes sense) but it was a little frustrating that it could not be controlled by the keyboard. Also, regarding the hints it would be better to have them activate on entry to some collider and then deactivate on exit without the player having to manually close them with the mouse. These kind of things would help the game flow better,
I see that you are looking for constructive feedback so I tried to focus on that. Overall my experience was quite good. Well done.