Simply Amazing
Positives:
The sound effects were astoundingly creepy
The atmosphere all around you kept things interesting...and terrifying
The art was great for the genre
It was all so mysterious and thrilling. Kept you geussing
The puzzles were reasonably well thought out
Neutral:
The one puzzle that didnt make a whole lot of sense was the fireplace one. I understand you wanted more puzzles, but I could've just used the gas to blow through a door or the bricks, and simply searched for the key in the fireplace
Negatives:
The only negative here is the lack of a sequel ;)