Overall this game gave me a good sense of mystery. It's unsettling, but grounded enough to feel realistic, and I especially enjoy how the physical suspense is interwoven with the emotional tension, for example by having the forest become increasingly sinister as the characters' arguments escalate. And he details like Mickey's hair tie, Rivera's tide, and Lottie's blood make the characters feel like PART of the environment beyond simply existing in it. I was sad when it ended, so you've definitely built up the intrigue successfully!
I got to a point where Mickey disappears. I agree with some others that it's initially unclear if the player is "playing" as all three (Lottie, Rivera, & Mickey) at once, or if they're a fourth character who's mostly observing. The ambiguity didn't bother me, but if that distinction is important to you, you might mention early on that there are only 3 people. Sometimes I did find it confusing to recognize who was speaking, since the initials are small and easy to miss. I think it would be clearer if their full names were written out each time, or if you eliminated them altogether and only used tag lines (like a traditional novel)