And yes, i probably haven't put it well - i know about the genres in game info, and i love to open those infos, though i was thinking of something more user-friendly and even more detailed. Yes, tags could work, or even simple "menu" reachable somewhere in the main page where you could list titles by predefined sub-genres. It wouldn't be such of a problem even if it doesn't list every little game there is, as forums are already full of "Similar games to..." threads.