What about a horror game but the twist is that the whole time YOU were the monster. You have schizophrenic episodes and believe that monsters are attacking you. At the end of the game, it’s revealed that the monsters you “ended” were actually people you knew. One 4th wall break later and the player is shivering in their boots. Pretty cool, right?
You know I have the sudden urge to ask for someone to recreate Tetris. Since I legally cant ask to make Doo m (too violent for gimkit) I think Tetris would be the next best thing.