In your case I would recommend using the same page.
Typically, newly published pages get a boost in our ranking algorithm, so you may be tempted to create a new page to take advantage of this.
But, you can also be eligible for this boost by publishing a “Major Update” devlog and attaching files to it. (Assuming it’s been a significant amount of time since the page was initially published.)
A new page will cause confusion for those that may have added the existing page to a collection, waiting for a full release, which is why we typically do not recommend it.
Additionally, an established page will have a better “historical” score for our popularity ranking algorithm, compared to a brand new page. The views/downloads/etc. that you have accumulated do count for something. I made post outlining how some of our algorithms work here: https://itch.io/post/1276094
Hope that helps