During the investigation, it tells us to change the selected item with Pgup/Pgdn (on keyboard). Maybe you should also mention that Q/W work too. They're much more convenient.
OMG, I don't think we had any idea Q/W also work. I don't know if we'll ever update the build [...yknow, game jam game] but this is a great find, thank you for pointing it out! I'll add it to the page description at least.