Is this 100% copy or does it have any difference?
I'm assuming you are referring to a copy versus the MNF game.
The initial background and emotional tone is quite similar and both I believe are essentially kinetic. Whilst there are obvious correspondences in appearance of most immediate family members, there are definitely differences in the details of their background and personality and also in the surrounding characters. The past connection with the first sister is different , the pace with respect to romancing the second sister seems different and the appearance of the third sister also seems faster. I haven't finished the game yet, so I can't assess it fully.
There is no doubt where the inspiration for this game came from. But as someone who enjoyed (and subscribed to) the original a few years ago, I also enjoy this one. For me, playing it generates a nostalgic feeling as well as being a reasonably enjoyable game.