Hi I played through some of this (I think for about 5 minutes?). I'm not sure if it was working fully, or maybe this is how it is, but -
At the opening screen it worked that using my keyboard produced sounds.
Once the journey started though, my keyboard was working in that it produced visual effects, but it did not contribute any sounds. And I felt that was missing and I wasn't so engaged after that.
Lovely creation, and whether it's a glitch or a feature or a result of WIP, I think if that sound is working so I'm making sounds throughout along with the music, that will be a really nice experience!
I played on HP Reverb G2.