I must admit I'm a sucker for text message-based games, but that said, I do love what you've done with the medium! The interactions with "Chloe" were fun and definitely unsettling, leading to a very satisfying cliffhanger at the end. The only other thing I'd add would be a bit more banter with the main character's friends - just something to give them a little more character/interest if you felt like adding anything.