An interesting narrative
While the decision to focus on a story may be somewhat of a downfall, it's an inventive jump for flash games and one worthy of merit. The story flows quite well, and leaves many unanswered questions, which is a good grasp of the concepts of horror.
But as I mentioned, downfall.
There isn't really much of a game. Enemies, for the most part, act as incredibly avoidable barriers leaving you to simply find alternate routes. There's no other challenge other than finding your way - not even the classic bottomless pits are hazardous, the gameplay seems to be equal to that of simply navigating a maze with the odd vanishing wall and collecting bonuses.
Also, the direction you're meant to be taken lacks clarity. I must have run around for ten minutes trying to find a 'weapon' with no real guidance of what exactly I was looking for. While the idea that your friend was getting her guts sucked out of her could have potentially added a challenge, it doesn't seem to make any difference in the long run and you can spend as long as you want working out the ambiguities of the tasks at hand.
While the majority of the voice acting was excellent, the voice of Anabel, notably the main vocal character, was incredibly annoying to me. There was a moment of 'Oh she's going to turn out to be the antagonist' in the elevator which never got resolved'. I'm not sure if it's the writing or just how the lines were delivered, there was just something that made her seem so miscast.
The story is the games saving grace, despite the gripes with the actual game itself, it was enough to keep me trying for 15 minutes to work out exactly what I was supposed to do when finding a weapon seemed like it should be worth it, and it was.