A small hotfix has been released to address a playtime-related achievement issue.
Changes in this update:
Fixed an issue where the in-game recorded playtime could stop increasing for some players.
Added a compensation fix for affected save files.
If you have completed all 300 levels, entering the game after updating will automatically adjust your in-game recorded playtime to at least 10 hours.
Sorry for the inconvenience, and thank you for your reports and support.