Thanks for reporting! I was able to verify the bug you found by trying to download and open the DMG on my computer. It looks like the packaging tool I used isn't signing the application properly and so the security on your Mac is preventing you from opening it. I'm trying to find a workaround for this, but in the meantime you should be able to open Utsu on your computer by forcibly disabling the security for this one program:
1. Open your terminal (Applications -> Utilities -> Terminal)
2. In the terminal window, type: "xattr -cr /Applications/Utsu.app"
If it worked, the terminal should show you a bunch of "Permission denied" messages.
3. Open your Applications folder in a Finder window, then right-click Utsu's icon and click "Open"
Also, the 0.4.2 update is
released! It's mostly bug fixes, but it does add a new Dark theme:
View attachment 9666