Thanks for playing!
The wonky controls were an idea that didn't quite work out, I think. I thought it would be funny, and I didn't have a ton of time to tweak them, but it seems they ended up often frustrating. It's worth noting that the wall brackets were a late addition, and they're kinda wonky in and of themselves.
As for the channels, I think the issue is with the source material. Big Buck Bunny just doesn't have a lot going on in the surround channels. There's some logic to fill channels from similar/adjacent channels, but at the end of the day each speaker plays a source channel- there's no true upmixing or downmixing going on. Subwoofers are particularly useless since they only play the LFE channel. In hindsight, I could have done some trickery with the source files instead of just splitting the provided audio into individual channels.
There's a diegetic, in-universe reason why there's no music past the second level. Think about what you sold them...
The media helper is something I personally would want to see in the game like this, but I can't help but feel I should have spent my time elsewhere. It's one of those things where few players are going to engage with the game enough- and be technically minded enough- to go through that kind of effort.