You made a really great atmosphere in the game!
Sound of rain, music and that dark room do the job! Riddles are pretty hard, cool mechanic of opening a boxes.
Probably could be great idea to give player some kind of lamp to hand (amnesia-like), otherwise is pretty hard to see in the dark.
What engine did you use? I had some glitches with light (flashing), playing on chrome browser.
Good job and congratulations on your submission!