Looking into SMT Nocturne, it's kinda similar in terms of both settings being post-apocalyptic and also being Difficult games. However, the difference is well, Changed is difficult due to Dragonsnow using copied code, not designing his levels well, and not quite understanding optimization and that's not even getting into that the fact that SMT is basically like from what I gathered is like persona but if it got Dark souls level of difficulty and also does not have a description that feels extremely misleading about what kind of contents you would expect to see in that game and lastly wasn't made purely to be a Fetish game that at best should have been put on FA instead of Steam.
so, if Changed is similar to anything, it would be those Furry dating games you see on Steam. Well, those games and especially Amorous, since both Changed/Amorous were made by questionable people, along with being games that were not planned well at all and a whole list of other shit that might have already got said.