I am not going to comment on the renders(why roast a pig if it is beat only half to death?).
Anyway. The story THEME is new.It could be developed into an actual story(needs work).
I like the fast burn of the story,but we get nearly zero information,background,or character development. It needs more of all three especially character development. Who,aside from nearly immortal and a scientist is the MC? Almost 500 years old,but still lacks any personality other than "I fucked up so I am going to kidnap people,experiment on them,then fuck them and Oh,I think going back in time solves the near extinction I caused of the human race,just need to steal a body and I am in the clear."
I did however manage to fuck above the lower limit needed to "progress" in the VN(it is not a game but VN in every respect). To be clear to hit that number you have to at least "loop" during a few sex scenes. In no way does how many girls you get/have really impact that number,just rather or not you ever hit loop. So...a VN with a very very tiny amount of grind to have a number high enough to have "passed". Still very much a VN with zero choice in anything other than looping sex.