Yeah days 1-14 are not appearing in the pause menu, and it drops me into day 15 when I press story mode. The main menu also does not give me access to the button locked behind day 8. I had played through the first 14 days right around week 2 came out, and I was pretty sure it had saved my progress correctly, but I could be mistaken. I haven't played any since then if that helps at all.
That does help. What’s most likely happened is your browser cache got cleared, removing the save files, and you unluckily started playing exactly when I accidentally left a test game in the browser for debugging something, forcing you to day 15, with no way of returning to previous days, because it defaults to the last day you played (where as it generates day 1 if “last day” is 0).
I have made a shadow update that should generate a Day 1 for you to use. You’ll probably want to use it, as prior days generate items that are going to be essential in later days. Sorry about the hassle.