Hi, what is the common practice when releasing a demo in itch.io?

So my game is currently available only in demo. 

Now my question is, how should I set the pricing? If I set it as free, then the files can't be marked as demo. Currently I have it set up as paid, but without a full game download. Is this okay? And will it appear in free category search (since you can't purchase the game yet)? 

Or should I just make it free and then create a new page once the game is done/released?

Also, I have noticed that the game shows the price in some parts of itch.io, and showing as free in others. Is this normal?

Thanks.