I don't think it's fair to call it a cult classic just yet since the game is rather recent, but eventually i think Kenshi. It's a really fun game although very grindy and i'm not even sure which genre it belongs to. Also it's very moddable to fit even more to your preferences. It's been quite a while since i played it, but i'll share a little story: I started the game for the first time and i wanted to make a "waifu squad" consisting of only women so i did. Worked my ass of mining copper and selling it in order to hire more ladies. Eventually my two ladies started to build a base near where i was mining copper and then one day, the "prayer day" (or whatever it was called) came and an army of crusaders came to spread the word of god. The bishop asked my main lady if there was any men in this settlement and of course i answered no there is none. To them it was blasphemy to not have any men in a settlement and the army slaughter my two ladies like it was nothing. Too bad i lost this save since i've gotten a new PC because i would've wanted to go on with my vengeance story, but maybe i'll fire it up again.