Great atmosphere, with a good sounds design quality.
First of all, some message to tell people to use headphone or at least have increase the volume would be great, has all is based on sounds (I had to read makra comment to realize it).
Camera mechanic could be cool, but seems to be rarely used or hard to used at the right time (I don't know).
The camera movement often 'reset' (is it done on purpose ?)
This could be greatly improve by helping user a bit more, increase hint sounds volume over time, even some subtle lightning hint..
Overall the was a great experience, just need to be a little tutorialized.