Idk I don't have O.C's for that (still) but, I do have an O.C. named Yumeii that I made when I was 10 that just happened to ALSO be stalked like Lacey and from a lost game, just that instead of it being a flash game it was from a visual novel :p
I'd make a movie theater game. You'd be given different tasks like serve the customers, make sureĀ the movie runs smoothly, and clean up after them. I like the idea of the fear of the unknown. But I'm not sure what would be scarier, a cryptid or a human being. Maybe it would just be the darkness. I'd probably use my oc, Esther. He's scared easily and kind looks like Lacy. Perfect horror movie protag.