Hi Sekki, thank you for reporting this and I'm truly sorry for the frustration.
I investigated your account on the server side. Your ranking data (11,700m depth, 139 expeditions,
41 species discovered) is still preserved on the server, but the full save data — your creatures,
gold, items, and progression — was stored only in your browser's local storage, and it appears to
have been corrupted or cleared. When you refreshed, the game couldn't find valid save data, so it
prompted you to start over. I take full responsibility for this — relying solely on local storage
was a design flaw on my part.
Your account is still recognized as "Sekki" on the server, and I can restore your progress. If you
can tell me what you remember — your equipment level, roughly how much gold you had, which creatures
were in your tank (and their approximate levels), and any items you were holding — I'll rebuild
your save data and get you back to where you were.
I'm also going to implement server-side save backup so this never happens to anyone again.
Again, I'm really sorry. Losing weeks of progress with no explanation is unacceptable, and I should
have built this safeguard from the start.