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It's on sale. Just bought original AITD 1-3 trilogy. Is New Nightmare worth playing?
I would say yes.
Objectively, it's a decent Resident Evil clone, does nothing amazing or particularly superior to every other RE clone (or RE itself) to stand out of the lot.
Personally, i'll always have a special place for it because it was one of the games that introduced me to the horror/survival horror genre, one of my favorite genres still to this day.
Give it a shot, it's a cheap game anyway, just don't expect it to amaze you.