Very enjoyable. It's a classic scenario that works well for short horror games. There is a nice artstyle and music and the whole game feels very polished. Not too scary, but it managed to make my palms sweat when running away from monsters.
My only complaint would be that the characters' sprites look very... plain, when compared to their nicely detailed face sprites.
Otherwise, I'm very impressed by the scale and quality of the game. Astounding work.