Here is what I noticed, feel free to take any of this however serious you want to: The app feels like a proper Mac application. I like its look, similar apps t

Here is what I noticed, feel free to take any of this however serious you want to: The app feels like a proper Mac application. I like its look, similar apps tend to look much worse. (Except for, I’m sorry, the icon.) I don’t like the keyboard shortcut for zooming out, backspace just feels wrong and always seems to be so far away from my fingers. Other shortcuts are missing altogether. Since your users won’t be typing anything you could use keyboard shortcuts without modifiers across the board. I would use + and - for zooming in and out, command+arrow for moving through the history and the arrow keys for moving the selection. (At the moment the arrow keys just do nothing.) You should also throw in shortcuts for showing files or folders in the Finder and for moving files or folders to the Trash. (Are there any good reasons why it is currently not possible to directly move files or folders to the Trash from your app?) Whatever you do, add plenty of logical and easy to remember keyboard shortcuts. Besides a better keyboard shortcut for zooming out, you maybe also need some sort of mouse-centric way of quickly zooming out. Moving all the way up to a toolbar button to zoom out feels clunky in the age of Google Maps. I don’t know what would be a good solution in your case, others use gestures or scrolling. You might want to look into that. Zooming out needs to animate. Currently there is no indication which folder the user just zoomed out of which confused me many times. Animating zooming out would provide users at least with a hint of their place. You could also automatically select the folder the user just zoomed out of. I don’t know how hard that would be, but QuickLook and file previews would be nice additional features.