- crop the image or fix just the height in the thumbnail section so they don't get distorted. Electron means it's with CSS, right? the background image can crop via CSS.
- don't make the user wait for the animation until he can interact again. I want to tap the arrow keys twice fast to quickly skip ahead.
- hide bars delay and animation speed should be set much faster by default.
- hide bars should include the thubmnails button
- fullscreen deserves a button.
- menu bar should dissappier in fullscreen (I'm on windows)
- auto-add all images of that folder if just one image is opened (this is default in windows and I see mac people stumble to show a few pictures in big all the time)
- hide the thumbnail list by default so the auto-add does not add clutter
- the black bar on top is mostly empty in the middle and just occludes the picture, maybe just a small rectangle for the controls was better.
- I think a more discrete border with the thumbnails would look better (50% grey, 1px, 2px rounded edge. white or turquoise for current image)
- most of the settings should be hidden in an advanced section
- on windows it does not seem to register the file associations
- on windows I'd like to be able to choose the installation path
- nitpicking: the logo/icon does not work well in 16x16px