It might be wiped if you went from 0.7 to 0.8, but It shouldn't have wiped after that. Saved data is stored in your browser. Did you clear your cache or run in incognito?
Playing the downloaded version, its been a while since i updated so probably the 0.7 to 0.8 thing
Oh yes, I started using a different engine to build the game for the downloaded version.
