opened this week at the Lyceum Theatre, attempts to be a new horror movie on an old Broadway.Such a merger sounds smart in theory, with the genre doing reliably big business at cinemas and boasting hoards of ready-made fans. Why not produce “M3GAN Live,” or “The Nun” in two acts?Well, for one simple reason: because the kind of paralyzing fear and gruesome death that fuels horror films is just about impossible to satisfyingly replicate at the theater. 1 hour and 40 minutes with no intermission.