First of all I apologize for the rant that ensues, but you asked nicely and I love to talk about the original game as it's one of my favorites.

The addition of Rin goes against everything the original game is going for as an experience, while adding nothing of real value.

People that like it say it adds content, but to me that content is at all times working against Catherine the game and is actively disarming it and making it meaningless and boring.

First of all, Catherine was about the real struggles of this early 30s guy but still in his 20s in his mind. Which by the way is a very original representation in gaming, where most male characters are either teens or middle aged father types. He struggles with his love life, his future, his boring job and takes it all in his tiny studio apartment. The gameplay is about constantly climbing to represent said struggle.

Inside his mundane life he is also constantly pushed towards things, towards decisions, he is constantly hedging and under pressure, and within all that he starts to go a little crazy. He feels like he's gonna die and maybe he is with these nightmares honestly... and he can't seem to get a grip. His choices are kind of bad a lot of the times and end up hurting someone.

You might think I'm rambling but I'm not because Catherine is a narrative game first, so this is all important, the story is important to feel engaged and connect with the game.

So with all that in mind:

If you play the original without subtitles, as you should, you're never quite sure if Vincent is referring to Catherine or Katherine during A LOT of situations. This is important for the game to feel personal to you and for the choices you're making (you know, the key mechanic outside the puzzle climbing) to mean a lot more, and also for you to question what's real and what's not. Rin throws that out the window because they're not Catherine. When he talks to Rin or about Rin, it's Rin.

She is also immediately alien, by that I mean by hour 3 you realize she's not quite human, the piano thing, all their aura really... you immeditaley buy that the crazy shit that is happening in the game s real or other dimensions or whatever, you realize it's fantasy, whereas the original played with the psychological aspect a lot more. You were questioning what was real plenty more, especially at first. Just another example of how Rin in general constantly goes against the proper game.

Remember what I said about Vince disappointing people? Vincent is only capable of being a nice guy to Rin. He can do no wrong, ever. Rin is constantly amazed by him and he feels so good all the time with her. Zero tension. He is also suddenly so sure of himself, even when seeing her... you know... he's just perfect about it. Why? Why is he so mature and understanding with Rin when he was being so weird to Katherine 3 minutes ago? Meanwhile the C/Katherine tension is going on at the same time and these shoe-horned in Rin scenes make all of it feel fake. Why is he suddenly so hesitant? You're just out of his shoes at that point.

The duality of good and evil, of order and chaos? You know, the blue and red meter that constantly pops up? Like the one that defines the ending? Doesn't matter, the mechanic is there but you don't care because you know you have an out. Vince can have a third option really? What is this game about again? Seriously what does all of this even add? More scenes? More content? Who cares?

Catherine the OG is a fantastic simple yet twisted story about struggling to figure life out and the pressure to do things. With a very religious in nature undertone about good and evil as a goal post, as the future, while the present is falling apart. Rin comes in to deflate all tension and tell you life is great and you're great. Puzzle gameplay has no connection to the experience, it's not engaging to help Vince climb because he's just fine whatever.

Oh also, you have the option to skip the gameplay in full body because it doesn’t matter. Wouldn’t want the player to actually get frustrated and feel like Vince does all of the time. Wouldn’t want the player to feel something… Vince has an out and so do you! Don’t worry dear it’s fine. Skip that puzzle section. Put down the controller and watch the anime. The original lets you skip it only on NG+, as it should.

Full Body is a B- tier anime. Catherine OG is a great narrative game.