The visuals and atmosphere are fantastic, but the controls and platform sizes and placement need work.
It took me too long to realize how the light increase worked, and you really have to be right on top each other to get the benefit, so the moment you jump, you can't see where you're going.
For a long time I was just learning the map by jumping blind, but even when I would wait for the light boost and knew exactly where to go, I would miss/hit it and slide off and run all the way back to try again.
I really wanted to see where the story would go because it looks like there was a lot of thoughtful work put into the visuals and design, but the platforming became too frustrating to continue.