The game mechanics are a little different, but once you get used to it it becomes a good game. It's always good to fuck married women, I wish more big games had NTR like that.
I believe the biggest flaw I found was not being able to use "skip mode" in some repetitive scenes (like taking the bus, that part was always boring), and the game stucking in some quick-choice parts (my PC isn't very good). Otherwise, very good game.
Also, an addition that would be really nice would be a gallery and character bios (maybe on the MC's cell phone)