Yes this is a bug with the mobile port, I've fixed it in the 1.0 build, planning to deploy in the next day or two. Apologies for the errors!
I started playing yesterday (so v1.0) on my iPad and when I opened my browser this morning (still v1.0) my save was gone. I refreshed the page and the version updated to 1.1, but I’m reluctant to start over in case this happens again—especially with a patch note saying that the endgame has been made slower.
Have you tested this on mobile?