Hi, this is Taylor. I'm an organizer on the bundle. I'm answering the question on my account since I don't want to lose track of this.
After May 3rd will be a week or two finalization process. People will get a secret url where they can post a link to their game. As organizers we will check each URL submitted and confirm that there are files that we can load and "experience". A good example of this is a game I love called Cuckhouse.
https://vividgrim.itch.io/cuckhouse
Cuckhouse as a Unity game is not playable. I cannot download it anywhere. Cuckhouse as a zine is something that I can experience right now. Cuckhouse as a zine so it is completely acceptable to submit to the bundle.
As long as the URL you link us has something I can experience then it's fine. Even unfinished games can be interesting and enjoyable to experience. What matters is that it contains something. As an organizer I don't really want to police devs too much except in the most egregious cases where I suspect fraud.
Update as much as you like. Make whatever you like. We will support you.