I just finished the demo, and am kind of interested in where the story is going. I was confused that both women were named (K)Catherine. I thought Katherine in the cell phone was a game mistake at first.
I'm intrigued about the text messages and "morality meter. It would be great if the text messages I send have game changing ramifications that make the game completely (at least mostly) different on each subsequent play though. I don't really think it will pan out that way though. I guess that I really can't judge that aspect until playing the actual game.
As far as gameplay is concerned, I really like it. It reminds me of the Playstation One game "Intelligent Qube", only you play vertically instead of horizontally. The big problem I see is in Catherine's replay-ability, because once you've solved the puzzle you'd be done with it forever, unless your text messages do change the story and puzzle outcomes.
I'm not really sure I can justify throwing $100 dollars at this game. I think I'll wait for some reviews to come in before I put anymore thought into it. I'd be pretty pissed off if I did end up buying it and the game can be completely beaten in under five hours…