Cute and original; I’d love to see more levels of this :)
I found the spirit’s hit box to be a bit hard to get used to. I quite often died because the shadow was over the spikes even though it looked like I wasn’t. I think it might feel a bit fairer if you were a bit closer to the ground the the player sprite and ‘safe’ area matched a bit better; especially as there’s a degree of precision needed for these puzzles.
That said, I made it to the end, and enjoyed doing so :D