Maybe try having both a full playthrough for the dev to watch, and a short video of clips from the game play.
The longer gameplay video is most useful to creator of the game, maybe with a facecam to see what you are expressing.
The short videos you can use as more of a "moral of the story" type discussion, with the game being used as an example, but with thoughts and ideas that can exceed the scope of the exact game in question.
I hope this made sense xD
I do some feedback videos for devs on my own channel that you might be able to get some ideas from.
I'm not going to link it here, I'm not trying to hijack your discussion, but if you would like a look just ask! :)
Good luck with your channel friend! All the best