Demos and unfinished games are frowned upon, but if you're talking about taking it down just to clean up or expand, there's no issue with unpublishing it a little while. Though generally you want to have your game as complete and polished as possible before putting it up in the first place.
You probably haven't looked through many of the top stories yet if you're asking about length. :D
Anyway, welcome to the forums. Drop by the Writing Workshop sometime if you want to put up some samples of your work for advice or feedback, or want to play around with some quick writing prompts.
There's also a Halloween contest that's just starting out, might be a good way to get your feet wet if you can find a co-author.