Some games don't work, despite what ProtonDB says, such as Stardew Valley.
Thanks for confirming that you're seeing the same thing. Must be a bug.
Unfortunately, --all isn't an option. The following options are available in swayimg:
Mandatory arguments to long options are mandatory for short options too.
-r, --recursive read directories recursively
-o, --order=ORDER set sort order for image list: none/[alpha]/random
-s, --scale=SCALE set initial image scale: [optimal]/fit/width/height/fill/real
-l, --slideshow activate slideshow mode on startup
-f, --fullscreen show image in full screen mode
-p, --position=POS set window position [parent]/X,Y
-g, --size=SIZE set window size: [parent]/image/W,H
-a, --class=NAME set window class/app_id
-c, --config=S.K=V set configuration parameter: section.key=value
-v, --version print version info and exit
-h, --help print this help and exit
If that let's you flip between images that are in the same folder using arrow keys (or something similar), that would be awesome.
Gwenview looks a little too full featured, but the Gnome Image Viewer (Loupe) works well. No dependencies needed in Nix, and the arrow keys let you flip between different images that are in the same folder. All of the on-screen functionality works (copy, move to trash, zoom in/out, toggle full-screen, etc.), and keyboard shortcuts and gestures work great. The only bug I have to work out is that it doesn't respect the gtk theme I have configured (GTK 2, 3, and 4). Otherwise, seems like a good option.
I like how it supports animated webp and gif files right out of the box. Would be perfect if you could open images from the file manager and navigate, but it doesn't look like that's in the works.
Can it reformat icon shapes?
Regarding App Lounge, the downloads section in that link says it will only work on their playform. I'm running GrapheneOS.
It's a 2013 macbook air, which is weird because when I had OSX installed it played Stardew fine.