Nice writing and dialogue. The jumping was just too difficult for me. Too much slip on the platforms and too much bumping my head. By the time I managed to get up to the first soul I was pretty frustrated and then the next one relying so heavily on timing the double jump, after 4 failed attempts, I did give up.
I liked that you ease the player into the different abilities but I think you could have eased them into the difficulty too. You can even see the first soul when you get the quest. I liked the little bit of forth wall breaking but I think you could have gone further and had it be literally a series of evenly spaced platforms leading up in a spaced-out stair formation.