Oof. The concept is amazing. I love the theme and the fact that you're also bringing some awareness :)
It was maybe a bit too difficult... maybe if you choose to further polish it, add some sort of mechanism to be better able to tell where you're moving when in the dark? Maybe you can see a faint shadow of yourself but not anything else... or maybe a screen or sound cue when you're close to a ledge and would otherwise fall down.
It's one of the most creative games that's I've played so far though,