I don't think so many people actually care about storylines in games. For the sake of "ahrt", many developers try to shove super complex and ultra depressing plots in their games, even in simple-looking ones that wouldn't fit well with such plot. I really dislike it when it happens, very often an overly complex plot ruins the fun of playing games. It can also depend from the tone of the game (for example, games with realistic or semi-realistic character are going to look differently from games with cartoony ones), but a plot should stay as simple as it can be, unless it's an RPG of some sort (and even in that case, overly complex can be negative). I would also avoid overused tropes as well, and think to something more original, even if it had to be something really weird: many games have very weird plots that make little sense but are fun anyway (Super Mario games were - and still are - like this).