This game is like a power fantasy for subs. You don't have to work for anything, she just likes you and wants to do all these sexy things with you right away. In that sense, it's very fulfilling a perverted sense. Love it.
Downsides are the abruptly short length and oddly cartoonish presentation. That first point isn't a hit to quality, though, and the second is subjective. Overall, very cute, has some neat ideas, and very strong "God I wish that were me" energy.