It should be noted that Default.png and Default@2x.png should be rotated 90° to the left for this to work, these files are 320x480 and 640x960 respectively (as in Portrait orientation).

As for the icons, there are some things to notice, e.g. that the 50x50px one is actually 48x48 because iOS trims off the edges etc., the Apple support docs for *that* are understandable though.

I think the only weirdness I can see in my game is that the volume control bezel is upside down sometimes.

It is kinda dangerous to use the "human-readable" names because they might or might not be translated into their actual identifiers. Updated the screenshot to show the raw identifiers which count. I couldn't upload to the App Store simply because I had a key "Icon files" which should be UIIconSomething...