Thank you for taking the time to play my game and for the detailed review.
The Z/Y key issue should now be fixed. In the end, it was just a typo in the description, and with the next patch the hint text has also been removed. If you still encounter any issues, please let me know.
The UI issue should also be fixed with the upcoming patch. It was caused by an incorrectly set tolerance for the yaw axis in the UI itself, which was previously set to ±2° deviation.
The duration of the dialogue displays is indeed quite short, I admit that. This could be improved in a future larger patch.
I can try to build a Linux version, but I currently don’t have a Linux machine available for testing, so I’m not sure whether it will work. I will upload it with the next update. Feel free to let me know whether it works for you.