Solid entry; one of my favorites actually! Very nice mood with the graphics, audio, controls, etc. Everything is smooth and generally works how it is supposed to. I love the flashlight effect and the stippling (I think it's called also) also! The general mood of the island is amazing, very slow and creepy if that makes sense. I love the soundtrack in all its ambience!
Everything just clicks with this game, besides directing the player a bit more with what to do at times. I got confused near the end by not going to the puzzle (I think) and getting some dialog that tells you what to do over around the crystals. Oh well.
Solid experience nonetheless! Would love to play a full game like this. To me it feels like a grown up Pitfall game mixed with some of the story and lore of the TV show Lost.