Huh. Just got here, was super hyped about seeing the new version having come out - and apparently have lost my progress. Not sure why, haven't cleared cache or anything like that. Not super worried about it honestly, but figured I should mention it, wasn't sure if it was intentional or not.
Thanks for mentioning this! This does seem to be a widespread issue, which is different from the random deletions that happen on the web version. I think this happened because I added a new difficulty mode. I'm sorry about this! It is not intentional for players to lose progress. I will try to add cloud saving as soon as possible so that this doesn't happen again.