Two girlfriends go to an island. One disappears. The other goes looking for her and finds out that she can essentially die and keep going. Often she has to cut off a limb and use it to move forward.
Meanwhile you are chased by a demon who is her subconscious. She has to beat what's been holding her back in order to win the game.
This is a puzzle game and some of the puzzles are really hard. (I had to wait a week before the walkthrough came out to beat one puzzle. All the others I was able to figure out on my own eventually.)
The graphics are not great. On the level of a PS2 game. And you can only move left or right. That didn't bother me. Might bother you.
But for a cheap indie game I found it excellent.