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Hmmm… Growing a community is hard. The best examples I’ve seen were either multiplayer games (MMORPGs in general, The Kingdom of Loathing, or Terraria) or singleplayer games that were… not easy to get into and required having a Wiki open (Dwarf Fortress comes to mind). Although I’ve seen user activity in Metroidvania help sites/Wikis and although I’ve contributed to those sites, I wouldn’t call that a community.

So your best bets to grow a community (from my limited perspective) would be to either go multiplayer - or make your game cryptic as fuck. :)