I find this game (if you can even call it that) so unusual and dense that I don't really know how to talk about properly. It really shook my heart and made me feel a certain way even if I didn't entirely understand what was going on. I'm still sort of reeling from the experience. Lain PSX presents a lot of existential questions and scenarios that I found deeply moving and disturbing at times. With how intimate the diaries and files are in this game, Lain and Touko come across to me as some of the most believable and human characters I've seen in a game. It really showcases how profoundly loneliness and isolation can affect a person's mind, especially a child growing up. The game makes a lot of use of psychiatric terminology to go about this. It clearly feels very well researched. Never gonna forget this game.

If you love the anime, I urge you to play this game. If you love the game, I urge you to watch the anime. Many of their themes and ideas are tightly intertwined and certain concepts that are mentioned or can be inferenced in one medium are expanded or elaborated upon in the other. The two are definitely most rich when experienced hand in hand.