We apologize for the inconvenience, we are currently investigating the data loss issue. If we may know what OS are you using?
Windows 10
could you please tell me the details of the missing data? like gold, shop upgrades or achievements etc.
Intact: 3rd character unlocked, stage difficulties unlocked, purchased upgrades. Lost: achievements and associated database unlocks (i.e. archmage, killer drone, etc.)
We have fixed the saving system in version 0.5.6, hopefully it can run properly :D