You have such a way of expressing melancholy through just the strings and piano that I don't think I've heard from anyone else. The strings are warm and familiar, the piano is a string of nostalgic memories, and they come together so beautifully. All of these songs are so full of emotion, though it does feel a bit like it's the same emotion throughout. With "In Pieces of Mind" it sounded like it focused more on the higher strings taking the lead and I'd really like to hear that explored a bit with more instruments throughout.
Also this is just a complete guess and I've only read the steam page for the game not played it, but the story wouldn't happen to be based on "The NOexistenceN of you AND me" would it? It feels like it's taking some inspiration from the game's concept (which is a cool concept I wanna play it sometime). Overall great stuff, I love taking inspiration from songs with emotional piano :)