Interesting concept! This was quite an atmospheric game with a very strong idea. Two things: the character controller is a little unresponsive, and the darkness effect seems to break on the second level.
Thanks for playing! I have noticed that the character controller is wonky when playing in browser, but I haven't noticed the issue when I play the game straight out of the Godot engine, so it might be an itch.io issue.
Secondly, the darkness effect not working on that level is totally my bad, I forgot to turn it back on before updating the files on itch.io!