Because this is not one of those clicking-till-you-get-the-right-answer visual novel, but it's one of the simulation game that require strategy and planning to win any of the girl. Also , once finished, it will be the first Thai dating simulation game with Thai school setting. At least it's one of the rare non-japanese dating sim :P
Still, I think you've only played those dating sim flash games. This is different. Please try Tokimeki Memorial, Aitakute ~You Smile in My Heart~(This one is brutal. REALLY DIFFICULT), True Love Story 1 - 3 or KimiKiss since those are ones of the best love sim game out there (I prefer calling them love simulation rather than dating simulation). And I'm sure my game will give you the same experience that I had when I finished those games. Fun.
I'll repeat again. DO NOT CONFUSE THIS GAME WITH FLASH GAME DATING SIM! These game relies much more on scenario and character developments while you have to plan your strategy to get each girl's heart. And you'll need different strategies for different girl. (Well, obviously for Moree, since she isn't a student and you can't see her everyday at school!)
If you still not satisfied, then I'm sorry to say that maybe you're not our target. But if you're into heart-warming stories, and a game that requires a lot of strategies (For more difficult girl like Dao or Flute), then this is the game for you. Not to mention the multi-endings for each girl :P