Hello, thank you! We don't own a Mac ourselves, but a contributor who does tried to download it and it seems to be the 0.9 version. Is it possible you downloaded an older version by accident? Maybe by clicking the download links on an older development log?
Huh. Weird, I redownloaded it, and it was still 0.8.3 both in "Get Info" and in the app. Then I deleted all traces of Pixelorama from my Downloads and Application folders, redownloaded it again, and there was 0.9!
I'm guessing it was either launching the old app when I tried to open the new one, or the old .dmg was being opened after the download. Sorry for the confusion.