No, this is not a revamp of any existing game. This is a parody of DxD hence the similarities, this game also features minigames but they're skippable by autowinning them through the use of FPs.
weird, I played an AVN that shared all the attributes. I think it was named something else. I sadly cant remember the title. The mini games it had kinda killed the game for me. Had to watch for hidden symbols and whatnot which kinda took focus away from the actual title. I think I managed to clear the first chapter in that but it wouldnt let me progress to chapter 2 because I was missing points and had to go back in time blah blah. I lost interest. If I find it again, I'll link it.
The mini games you devised are nicer and dont pry the focus from the title itself, but almost script for script, its almost a match. there are sublte differences between the two.
as for the show? (I'm guessing its a show) never saw it to be honest
Yeah, script makes sense since it's a parody. I'm a little surprised about the attributes since those were customly made, but I suppose they're pretty common in RPGs (Attack/Strength, Charisma, Agility, and so on). There should be some things that are found only in this game though, such as the collectibles/hub and how you'll be able to interact with women living with you in future builds.