The developer hasn't bothered to build a native Mac OS X application. It may run on the platform, and appears like a Mac application, but the application has many shortfalls that will only hurt its adoption.
- menubar on the window rather than at the top of the screen
- multiple toolbars, none of which are the standard type
- blank window of first run
- spacing of window elements is awkward and ugly
One interesting observation is that the download is only 6MB for the Mac, but 22MB or over for Windows or Linux.
I also have to commend the developer on the integrated Feedback window.
If this application is going to garner any loyalty, they'll rewrite it as a Cocoa application, or at least fix some of the shortfalls. The app has potential.