I loved the change in atmosphere due to the changes in environment when switching. Random beating heart, creepy eyes, tormented beings, etc. Excellent stuff. Wish the music was a bit more sinister, it's too gentle and laidback imo.
While the candle recharging mechanic is neat, I found it to become a waiting game, because you can't always progress in the dimension you're waiting in, and you don't want to risk getting snuffed because you just entered an area without any dimension shifting or candle pickups.
Is there any way to get health back? I died in the (huge!) area past the first gate, unlocked another key, but didn't yet find a matching door. I was walking around with 1HP for a very long time, and then I got eaten by a random enemy and lost all progress :'D
I think the biggest miss is the level size. The puzzles that I encountered so far were neat, but that second part is just huge for no reason and therefor kinda confusing, which turned me off from retrying the game. If that were to change, and with a bit more spooky music, it's turning into a nice game!