its up to u to rip off a game
This game takes inspiration from other games, but it is by no means a rip-off or a clone. I'd also like to point out that some of the best games (most if not all) came about by being improved versions of certain game styles and mechanics.
For example, look at Diablo. If you go back far enough you see similarities to Gauntlet. Yet Diablo took that style of game and its mechanics, made them its own and improved on them dramatically to make a fantastic game. Then you have games like Path of Exile and Grim Dawn (built in the Titan Quest engine, so the same could be said of that one) that are still action RPGs in the same style as Diablo but with different skill systems that make them unique and strong games in their own right.
RPGs in general are always going to be based on a previous system and are the easiest to identify how they've progressed over the years, but you see this progression in many other genres as well.