I will not have the time to watch a playthrough of this game, even if you edit it down a lot. Still, here are some thoughts.
Zoom level: People, who haven't played the game, need to be able to recognize what's going on, so don't zoom out too far. Consider mobile viewers. 1.5x zoom should be fine I think.
Walk and shot speed: Similar consideration. Probably start out with a lower speed, than what you personally play with. Increase speed a bit later on, once you have more agents and enemies in missions.
Music: Definetely leave it in, the soundtrack is essential to the atmosphere. Just not too loud. Only turn off the music, if you decide to make a lot of edits close together, because constantly skipping music is jarring.
Now the most difficult topic: Editing.
Personally, I like heavily edited gameplay videos. Time is valuable. I already have more media I want to consume, than I could do in 10 lifetimes. Aside from my personal tastes, I'm pretty sure, that the vast majority of viewers will quickly get burnt out from watching the umpteenth monster hunt and just skip ahead.
On the other hand, editing is work. Cutting out big segments is easy, but little nuggets of good entertainment and valuble information will often be hidden in otherwise boring missions and base management.
For me, Beagle's Ironman Impossible series is still the gold standard of how to record and edit a campaign in a game like this. As concise as possible, without missing too many important things (not to mention the humour, but that's an entirely different topic).
https://www.youtube.com/playlist?list=PLXctaw5JGF4LcidFVdkQMV1tc2DfC8x3DYou will most likely not want to go that far, though. Beagle himself stopped doing it like this after a short while, because the work was too much for him, leaving the series incomplete. And that is the reason, why most professional youtubers either upload mostly unedited footage or hire an editor.
Anyway, my suggestions, if you don't decide to upload an unedited campaign:
The further you get into the game, the more you will want to cut out stuff, which you have done a dozen times before already, and that is neither important or interesting. Stuff like: Micromanaging your storage; transferring items; most manufacturing; stocking your crafts; any lengthy decision making, for which you don't have any comments; enemy turns, if they take a long time and you don't see any activity (like often happens in terror missions); searching for the last enemy; even entire missions, if you've done them before and nothing interesting happens. Just the result screens will suffice in such cases. And maybe a single highlight or two, if there are any. Definetly always show, when a soldier dies or gets badly injured.
Recording your voice in the editing phase instead of while playing, will make the editing process much easier, while not taking much more time. That way you only have to decide, what pieces of gameplay to cut out and not worry, if you said something important at the time. You will have to rewatch all of your recorded footage anyway, when deciding where to make cuts. Just comment on the gameplay while taking notes. Of course this is also a stylistic choice and might not fit you.
Also, mistakes are more entertaining for the viewer, than a perfect run, in a game like this. Unless the mistakes are a result of not knowing the game mechanics. So don't be a perfectionist. Losing is fun!
Edit: There's one thing I forgot about the music: Most of it is copyrighted. The Youtube bots typically disregard videogame soundtracks, otherwise Let's Plays etc. would be impossible without getting into trouble. But XCF doesn't just borrow music from other games but also from other sources. THING.ogg and FRO_PSY.ogg belong in this group. But I don't know the origins of all of the tracks and I am not aware, if Solarius has documented this anywhere.
So, playing the music in some of the levels could lead to receiving a copyright strike, which then could lead to demonetization of the video. Possibly deletion? I don't know iof Youtube still does that.