Nice game, actually quite fun to play from what i've seen so far. Not usually the biggest fan of the koikatsu (i believe that's how you spell it?) style, but i've actually been enjoying it in this one. Good looking characters, well written in proper english and a somewhat crazy yet enjoyable story.
I guess if i had to pick one thing to improve though, it would be to add more variation to the sex scene renders. It often seems like i'm just looking at the same exact pose the entire scene, only shown from different angles and with slightly different facial expressions. I would like to see a bit more variation in that regard, but i haven't played through everything yet so i don't know how the newest scenes play out.