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

Hi! I browsed your website and wow! You are really taking this seriously! Already subscribed to your channel and will be waiting for your first video :D

As a dev that received many help from YouTubers and reviewers, even a video without any words and comments can be beneficial, watching the playthrough itself will provide a lot of information for improvements and bug-fixing. For the video style it's really up to you I think, but I do like watching the players' reaction while encountering certain events in the game, it's not necessarily a face cam, expressive voice will also do fine!

Best wishes!

I've always found it inspiring and neat to see YouTubers play indie games, especially smaller amateurish ones because those reflect how many of us start out (or where we still are). I especially found inspiration in YT series such as 3kliksphilip's Game Making Journey Series. I think these feelings are common among the community based on the YouTube popularity of many more successful indie developers, such as Dani and Blackthornprod.