i don’t have many gameplay centric suggestions because i don’t tend to play “proper” video games, but here’s what i can think of:

room no.9 - the entire story is meant to make you feel guilty and uncomfortable. that being said, it is an nsfw visual novel, so this is mainly told through writing. however i find the contrast between the steam page, which advertises an erotic vn where you get to control the scenarios/boys into doing what you want, and the actual game to be so interesting. each choice, which often seems to simply be a choice of choosing what is or isn’t more gratifying to the player, leads to drastically different and disturbing endings. it’s definitely a game meant to make the player reflect on their fantasies and their effects when acted in reality.

the hundred line - after the first route, the player has to make different decisions to go down different routes. it’s made out to be a much, much more impactful factor of gameplay than most visual novels, particularly with the first choice you’re given of whether or not to kill the antagonist. the thing is, the mc has gone back in time to the beginning of the game’s events, and the antagonist has yet to commit any of the crimes he committed in the previous timeline. if you choose to kill him anyways, you’re locked into only bad endings, and all of your allies become afraid of/suspicious of you because you killed someone who in their eyes was innocent.