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I mostly disregarded the gameplay (aka grading of pictures) and just considered it an exploration game: find the locations and also the environmental storytelling bits. And I highly enjoyed it for that.
I sadly was spoiled regarding the story, so I didn’t have that “wait, what exactly is happening here?” Moment. But nonetheless, the atmosphere really fits its name and considering how the real life is going, I sadly predict it’s going to be more and more relevant. But same as you, the last level hit me hard. I consider it good game design, that the game really trained you well, so I immediately understood what I needed to do to end the game. And it kinda felt natural, because it is the only thing left to do at that moment.
Ragnarrox did two very interesting video analyzing the themes and topics for each game (1, 2) and McGee himself commented on them that he felt understood.
And I seriously think they did the first game dirty by porting it to consoles. It was designed and programmed with a certain input (keyboard+mouse) in mind, a controller will make the impression of the game much worse for the player.