I really love this idea and there were a lot of creative uses throughout what I played.
I got terribly stuck on a stage where you have to toss the candle to the right and then jump back and forth between the moving spike balls. The second to last gif showing off this game actually. I made it a little further than that but not much.
Art and ambience are fantastic, I love the sound design and the way the shadows come. The mechanics keep being built up and expanded on nicely. Leaving behind the candle and then having to go to longer and longer without it. Tossing the candle and catching it on the other side, doing midair catches through a door, very fun stuff.