I'd also suggest maybe adding the channel names (like the comment you posted here) to the app itself (although i think it's cool when it's unnamed and you get the old-school feeling of channels just being numbers).
Also, I'd love to have permalinks for the channels. Not for the individual videos themselves, but just a link that when sharing would bring somebody else to the same channel you're watching right now.
Another thing, although probably outside your control, is that I use a Firefox extension called "SoundFixer" that I use to force the youtube audio to mono (since a lot of channels are annoying to me using headphones, they pan the audio sources too hard left/right and it's super distracting), but it doesn't seem to work on this website, probably because of the way they're embedded. I don't know if this can be changed somehow, or have a mode to force mono audio (which would be also oldschool like old TVs with one speaker only!). It's probably too niche and hard to do though.
Also I don't seem to find any volume control except mute?
I find this interesting. Are you oversensitive? I've never even considered that this could be an issue. Do you experience the same problem with other things like music and games?
For me, it's one of the worst audio quality issues a video can have.
However, I also hate knowing that I'm hearing mono audio where stereo could be used. 99% of the videos I watch don't have panning issues, so to just turn off ALL stereo seems like such overkill to me...