Make a horror game that's about you just doing every day missions (objectives) but slowly things will change everything objective, maybe a plant will die, some grass will be gone, until everything is gone and it's just you and a monster, chasing you down, now your objective Is to find a way out, and when you find a way out, a screen pops up saying you win and that you woke up from the dream.

You make the play think there’s a monster but really there is no monster

make a horror game about the old character being teleported to the alternative dimension