Thank you! Yeah, surprisingly, this kind of physical locomotion tends to work fine for people prone to motion sickness.
Regarding the buttons - our locomotion implementation does not work with physical interactions for now, so we faked it with overlaps and a heuristic to determine how far the button should be pressed. We also tried to mimic the force curve of a real mechanical keyboard with haptics, but I wish we had more control over them.
Loved your buttons too!