Conventional wisdom is that you should make your Steam store page live as soon as possible. That gives you more time to accumulate wishlists and followers.
You will get some traffic just by being on Steam. My page got about 200 visits per day and averaged about 3 wishlists per day. Not impressive numbers but they added up over time.
Found your game on Steam. It looks really awesome, I think you should think about translating it to other languages. Also, I don't see achievements there, the trophy hunters love short indie projects to improve their stats, so if you add achievements it would bring you much more sales.