I like how the game lets you focus on whatever you want instead of forcing you down a linear path. It's really easy to get completely lost as to what to do next though, especially if you're playing a translated version. I imagine if you speak Russian it's probably easier to follow the hints you get from talking to the girls. But at least for the english version I don't really have a very good idea what was said some of the time.
Something I think that's really missing is some sort of system that makes the bio you can see for each girl more detailed as you learn more about them, preferably including some mention of things you've tried with her that she likes or doesn't like. Without something like that you almost need a secon computer with a spreadsheet or walkthrough open to figure out what to do next. For instance where she lives, once you learn that info, whether she likes roses, chocolate, or whatever, and most importantly some sort of info about her schedule.