Actaully i've pressed save every few levels to be sure. Sometimes i've reloaded browser and game was loaded. And todays morning when browser restarted i saw again fresh game. Load doesn't help, all was lost. Maybe save was reseted due some patch and incompatibility between versions. I was playing on ipad - chrome, if it helps in any way.
Btw, game is great, i want to play again. I'm eagerly waiting for the patch to start again my path.