This atmosphere is just so insane! I did something like this by my self to I know how important it is for such a game and you did a fantastic job.
A very cool idea and the sound design with this graphical style just really makes me want to play it even more. I like that you event did these very small things of details, like that the chain sounds stop when there is only one left so no chains are there anymore.
The only thing is that at the beginning I was not sure what to do so maybe a little tutorial would have been nice but after a time I figured it out so its not that big of a deal.
All in all a very succeeded game and again the atmosphere with these shadows...definitely nice work!