Nothing like Zelda.
You (ICO) find a girl in a cage and free her. After that you must literally guide her by the hand thru the castle. When the shadow monsters show up to take her back, you have to let go of her hand and whack em with your 2x4.
Once you are free of shadow baddies (which only appear rarely-- the game is mostly puzzles) you must guide the girl to the next area.
The game (demo) is a hoot!! You press R1 to call her/hold her hand. When you climb up blocks, you then call her and ICO will bend down and offer his hand. She will grab it and you\'ll pull her up.
There\'s NO life bar, NO magic, nothing but you and her. I believe the only way to lose is if she gets taken away, or killed, and of course if you die. I fell off the damn windmill cause I was moving around too much:)