i just spawned at the start all of the rooms where closed and all my saved seeds where gone. my game never crashed
Okay, I'll make you a new save file, I do want to inspect the old one to see what went wrong. The only thing I can think of is that you had to many seeds or maybe it was an issue related to saving in the specific browser you have.
1. How far along were you in terms of upgrades?
2. Which doors did you have open in the main area?
3. What Browser are you using?