Thank you for the detailed feedback, this is really helpful.
The prototype was actually built to test the voice contronl, which is why there is currently nothing else to interact with.
A few quick questions
1. Is microphone access enabled for the game? In Windows -> Settings -> Privacy & Security -> Microphone, and "Let desktop apps access your Microphone" needs to be on.
2. Is Windows speech recognition set to English or German? The voice control uses the built-in Windows recognition.
Thanks again.