It has too many endings. By the time you've 100% it, you've grown numb to the horror of it. Reaching every ending is necessary to reach the true ending, and by the time you did, you're desensitized to the whole game, because reaching endings becomes a game of numbers, and you've seen the same unsettling scenes over and over and over again. DDLC pulled it's horror off because in order to 100% the game, you just gotta play through it two times, with reloading saves here and there. NSO has to be played through like 20 times before you reach the true ending

Other than that, it's a good game. The puke girl ending is really unsettling. I wish more of them were like that. I feel like a lot of the endings weren't as impactful as they should've been considering what was happening