Undertale
Monsters will talk with players during the battles, and the game will often tell the players what the monster's feelings and actions are. Enemy attacks can change based on how players interact with them: if the player chooses non-violent options, enemy attacks are easy, but they become harder if players choose violent options. The game uses many metafictional elements in both its gameplay and story. When players play in a boss battle more than once, the dialogue will change depending on actions from the times they played the battle before.