I gotta say, the comments here had me on the fence about this one, but I really liked it. Definitely on par with the main game in every aspect. Some typos here and there, but nothing major. Kissing animations were really well done, a lot of effort must have gone towards making those.
Lilly is my favourite out of the three girls (although every update Becca is getting closer to claiming that title), but I can see why some people hate/don't like her. So, for me, it was nice to get story from her pov and catch a glimpse of what's going on inside her head. We also got to see a little bit of how other characters interact when Frank's not around. The scene with Lilly and Becca in the elevator was great (+1 Becca
).
As for the scenes with Lilly's ex, from what I can gather they were necessary storywise. It seems to me that she's so desperate for love and seeks approval to such a degree that she uses sex as a substitute, if that makes sense. Sort of a 'If I suck dick or fuck they'll love me and I must be pretty, right?'. Even though I'm not a fan of those scenes, I can see why they were there.
For me the best part of the story was towards the end, when Lilly is reliving moments from the past in her bed. They were really nice. Though I agree with what has been said above, the ending kind of killed the mood. But I guess it makes sense to end it there since that's where the next update of the main game will start.