Not bad
I like the use of still photo's for the enviroment and the story wasn't bad but the safe puzzle was bullshit. you didn't leave enough clues and even the one you did leave wasn't at all obvious. I wasn't even able to tell the letters in the note were important, you should have made them stand out more or used a different color for them. and even then it's still a stretch to figure out.
The key hunting was a bit tricky (especially the school key) but wasn't a deal breaker and the scare moments we're nice though i would have liked a few more and mabey at least one more way to die.
Good attempt though, you nailed down the atmosphere really well.