This one is my favorite in the 'horror' category. Clever spawning of the monster actually caught me off guard! Audio actually kind of had me on edge too (playing with headphones).
One Note: On my first playthrough I kinda got "stuck" after catching my first fish, because I didn't know I had to press '1' again to cast my rod. I probably could have paid better attention to the provided instructions, but I think it would be cool if they maybe could be toggled on/off and/or displayed in the corner of the screen.
Overall, great atmosphere, sound, and textures. You have a good ear/eye for horror.