there's kind of an understanding that in the realm of video games there's a group of superfans that refer to themselves as "sickos", where a "sicko" is really deep into what makes a (usually niche) genre tick that runs contrary to what most people would think of as a "good" "game*"
there is a very wide range of sickos, ranging from the mecha-game sickos being served by AC6, to 4X sickos, to whatever sicko level this is
to me, however, the highest level of sicko is the puzzle game sicko. the ones who are really into la mulana.

i've been playing Void Stranger and it's absolutely for the fan of games that have what appears to be a straightforward presentation but a seriously staggering levels of secrets hidden underneath.
definitely try it out and then check out a discussion or two to realize that whatever game you're playing is not the game other people are playing.
caveat: there is one specific level that i would say is NSFW, so be aware when diving in!








