This collection has games which I personally tagged as Dating Sim Games.
My concept of what is a Dating Sim: "You will be introduced to a series of girls and/or boys, to which you'll have to interact with and slowly grow their affection towards you in order to unlock more interactions and make them feel more passionate towards you and your requests".
This implies that the games here have different tactics in order to have their affection grow. Have fun finding all of them!